Just to clarify, one does not get access to the pro model on the Pro plan?
Plus plan doesn't get the pro model, which is (AFAICT) the same 5.4 model but thinks like a lot.
You're trying to make words mean what we all think they mean. Stop foisting your Textualism upon us!
The $20 Plus plan still exists, and does not give access to the pro model.
The $200 Pro plan still exists, and does give access to the pro model.
What is new is a $100 Pro plan that does give access to the pro model, with lower usage limits than the $200 Pro plan.