I really can't see either movie getting a November slot, solely because of IMAX space. Both Wondy and Tenet have scenes and sequences filmed in IMAX, which means both WB and IMAX want them to have IMAX theaters as much as possible. Assuming Black Widow is on the 6th, which is very very likely, that's not only strong direct competition, but will probably command IMAX for at least two weeks, being such a big movie. If they move one or the other to the GvK slot, then they get to have it for 5 days until No Time to Die drops, which also was filmed in IMAX and will command those theaters for a few weeks, probably until December 18th. And sure, maybe WB could bully Black Widow on the 6th, but Disney and Marvel will have a lot to say about that.
I'm still very much in the camp that if Wondy doesn't come out in August, it's getting that December slot, while Tenet moves to next summer.