I think if you're within 2 weeks since purchase and within 2 hours of playtime it's auto accept

Not sure in your case but I'd guess it has been over 2 weeks since purchase. The auto accept part is literally stated in their refund policy:

It doesn't matter. Valve will, upon request via help.steampowered.com, issue a refund for any reason, if the request is made within the required return period, and, in the case of games, if the title has been played for less than two hours.

As well as

There are more details below, but even if you fall outside of the refund rules we’ve described, you can ask for a refund anyway and we’ll take a look. Consumers in some jurisdictions may have additional rights to a refund in circumstances where the game is faulty.

which is ambiguous and, from my experience, is definitely applied when the time played exceeds 2 hours.

Completely forgot to answer your question... IIrc it was sometime after 2018, they lost a court battle in Australia and decided to adopt a slightly more lenient than required refund policy globally afterwards.