Pentium II and 160MB RAM are plentiful, and it is no surprise that NetBSD is a breeze to use on it.
I got NetBSD running on a ThinkPad 760XD (Pentium MMX, 32MB RAM) which I revived around last summer, and it works just fine. Though running emacs on it is not a smooth experience with my configuration loaded, but it runs well vanilla. With enough tweaking, it can be a capable writing machine, especially with its flip-up keyboard.
The blog post is really good and insightful. I have never considered connecting aforementioned machine to the internet, but I think I might do it after reading this post just to try out Dillo.
I haven’t used Windows for more than a decade, and I am genuinely surprised reading your post that the game works in this manner even if with proton/wine layer.
I can’t help but think that this is an exception, and would attribute this behaviour to how the game is made. I wonder what other software function this way.