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Stop Using Your Face or Thumb to Unlock Your Phone
(gizmodo.com)
This is a most excellent place for technology news and articles.
On my pixel 6 it is power + Volume Up to access the power menu with lockdown.
I also have a pixel 6 and holding down power also works, though you have to wait a second. Power and volume up is instant.
My power button long press only activates Google assistant, it never pops the power menu. Maybe it's a setting somewhere.
Oh, yeah I think you're right. I think I might've changed it at some point.
Just checked and it's under system > gestures > press and hold power button