Now there, arguing that views on that site are useless and maybe suspect, if they do not result in downloads and comments, is something different than arguing that you see "patterns" and because of patterns those views are bots.
You do not need to construct a pattern based bot invasion. Because those patterns can be explained by other means. Even if you find games that show similar patterns, that does not prove anything specific. For video games there are seasonal effects. And even for a small platform, a popular game can attract new people to the platform itself and those new people might check out a lot of games at the same time, resulting in a lot of spikes for a lot of games at the same time.
There is two things here, and you do not separate them. One is bots visiting the site. For that you need just cite the relevant information from the site admins talking about that. Or just look at the bot counter they show. I do not know what these bots are for, and why it is 600+. And why the site knows they are bots, but does not block them. The only question here is, if those 600+ bot crawlers are shown in the statistic as views. I do not think so. It is 600+ and the spikes you show are well below 600. Also, it would be very unusual to count a crawler as a visitor.
The other is, that views are not resulting in downloads. The problem is, the first will not prove the second. Unless you can convince people that all the traffic is from bots. The number of views from bots is bound to be an absolute number and not a percentage. There is a countable number of bots, even if you do not know the number. The kind of bot that does illegitimate things and does not identify itself as a bot. Crawlers visiting a site is normal and would not show up as a visitor, unless it is malconfigured or intentional.
The gary mod statistic has a baseline of about 500. The height of the spike is 2500. So how many bots are there? And why is your spike not 2500, but 200? Why do the bots selectively target games and ignore others? Even if those crawlers are shown in the view statistic, maybe this just reflects an increased interest in the topics of a game. Those crawlers do summary snippets and other things. If people are interested in garys mod, more crawlers will try to summarize the pages of garys mod.
So let's talk about "downloads". The statistic you showed does have increase in downloads at those peaks. Up from 0 to a few and for the November spike even rising with the spike. Is there an expected conversion rate for that site? Do people go to this site to actually download a game? When I go to an example indie game like this one, I see a "download" button that does not show files, unless expanded. And it shows a link to Steam and to Itch.
This is my personal preference of course, but that db site is ad-ridden and almost unuseable. It ranks quite low in my own trust, and frankly I do not know that site and do not know how to navigate it. That game in particular has 8 different demo versions to download. There is not even version numbers. Just a dump of downloads to sort through. And I did mention, that the download needs to be expanded, while there is an attractive Steam button below? ;-)
Would I download from there? Nah. I would check the game out on Steam. Or maybe Itch. Also, the game is in early access. While I am not a user of that indiedb site, I probably would not go there to download games that are still in alpha or beta. Also the site has DB in it's name. I do not go to imDB to watch movies, I go there for information about the movie.
So is this free advertisement by having your game on indiedb a waste of time? Crawlers can find it there. And according to your arguments, they do that a lot and inflate your view counter. You are just disappointed because you do not see a direct increase in downloads. What do you think those bots do with the information? Do you think they increase the view counter just for fun? That information goes somewhere, and can result in someone knowing about the game and maybe even checking it out - at whatever place.
It will also appear in search results. This currently gives me these answers: Steam. Itch. SteamDB. Weebly Homepage. Youtube. ModDB. Nekoweb. Reddit. indiedb. Gamespress.