This list includes the base model CPU in the 2009, 2010, and 2012 Mac Pros, as well as some of the BTO upgrades. I'm disappointed, but not surprised.

The 2012 Mac Pros, in particular, were still being sold less than 5 years ago, so this means it's still officially supported by Apple. I wonder if there's some awkward conversations happening between the two companies about that.

Fortunately, it's possible to upgrade the CPU in a Mac Pro to a newer part which is still supported by Intel.