I think they were kind of in a bind, due to the timing. Python 2 reached its end of life in January 2020. They probably should have been preparing for it long ago (the original EOL was 2015, I think, but was pushed up to give people more time).

Given that, I can't see including Python 2 in Poser 12. Maybe SM should have done that for Poser 11, but that's water under the bridge.