How is this the first I’m hearing of it? Looks like I finally have a reason to own an x-box, aside from the best version of Perfect Dark (the HD release of the original with modern controls, I mean) being on the 360.

Perfect Dark works on newer Xboxes too. For Xbox One X and Series X it runs at 9x the res of the 360 version. It's included in Rare Replay which also includes Goldeneye 007 if you get it digitally.

They used to charge too but now it’s free. I got mine set up after about 30min of work a few weeks ago just need to actually load it up now. It’s tedious and you have to share your personal ID but it’s not difficult.