tor generally doesn't recommend running vpn over tor makes any of your opsec any more safer , in fact I can argue that it makes your opsec worse

but if a website is working on mullvad and not on tor and you are forced to use that website , then yes compromise your opsec a little bit I suppose

The point is not opsec but speed, under the GP's assumption that Mullvad exit nodes have better reputation than tor exit nodes. Not sure if the case, I don't use Mullvad.

I was talking about tor + mullvad where you first connect to tor then mullvad instead of obscura for connecting to a website where mullvad is allowed and tor is blocked like google(google's basically useless in tor thousands of captcha and then sorry mate we can't)

so I would argue that tor + mullvad is still a worse opsec than tor and it still has roughly the same / slightly worse speed with tor.

but I would also argue that tor + mullvad is a better model than obscura + mullvad for opsec but not for speed.

TLDR: Don't use tor with vpn's unless you are forced to (like website block , because then you are kind of forced to reduce your opsec a little bit)