While i dislikes ai i think it’s one of the only ways to create a foss software with a small time with a reasonably small number of people. But this does indeed just look like a no-effort ai post

Should be fine on more modern cars (ie. Everything with fuel injection, newer than 1990)

I run gas that’s probably 1-2y old in my pickup and never had any issues.

Just beware that ethanol might hurt rubber lines if you have them. So best to mix it with some new gas over time