They are using the m1 pro to get their battery claim numbers.
I ordered an M1 Pro based on the slightly lower price and my assumption that it will be less power hungry. If it is only 200 dollars cheaper why else would they even offer the M1 Pro? The extra performance of he max seems like overkill for my needs so if it has worse power consumption I don't want it. I could probably get away with an M1 but I need the 16" screen.
We will find out in a few weeks when there are benchmarks posted by 3rd party reviewers, but by that time who knows how long it will take to order one.