The argument is just about how the known probability of existing in a simulation goes up the more intelligent life we know to have existed in a simulation. Keyword being “known” as it’s the knowing, for a fact, that the odds exist that makes for an interesting thought experiment, especially when the odds of simulation are higher than not.
The actual probability is inherently unknowable for the reasons you’ve pointed out.
The obvious suggestion is Destiny 2, it’s a coop Bungie shooter with emphasis on movement. The expansion campaigns are fun and challanging on Legendary difficulty. Only thing it’s missing is the physics sandbox.
Epic is currently giving away the the Legacy collection for free which has three of the four current expansions. Absolutely worth grabbing and giving a go as I’d recommend to anyone starting the game to just focusing on going through the campaign as you’ll probably have a good, if confusing, time. The big downside is the fact you get thrown in half way through the second game in the serise so if you want to understand the story you will need to look things up.