It’s actually not really wrong. There are many VR games you can get away with low specs for.
Yes when you suggested a 3070 it just took that and rolled with it.
It’s basically advanced autocomplete, so when you suggest a 3070 it thinks the best answer should probably use a 3070. It’s not good at knowing when to say “no”.
Interesting it did know to come up with a newer AMD card to match the 3070, as well as increasing the other specs to more modern values.
Xubuntu is more than fine. Tbh it doesn’t hugely matter which distro you use for this type of thing