Well, if I ever become an arahant in this lifetime I'll be sure to let you know which descriptions held up
I think anyone who has not realized the entire Dhamma for oneself cannot know what is truth and what is false.. specifically in the matter of what is true about being enlightened.
It is my opinion that the suttas can certainly show us the right direction in which to practice and find out.
Ofcourse that being said, we can only speculate. In regards to the quote.. the models of enlightenment, it certainly makes sense to me that an arahant is not limited in action, thought, etc.. ofcourse you would probably not kill people or do immoral things, not because one is simply limited..
It is supposed to be liberation.. these models such as the limited possible action model, or limited possible thought model sound more like bondage to me.
but that's just my opinion, and I certainly cannot tell you from personal experience.. but some people can.. there are quite a few people who have reached the goal in our day and age,
obviously most won't say it outloud, mostly from practical reasons i believe, they are all over the spiritual map, different traditions etc..
If one is lucky enough to meet such people then you can ask.. or just once when one will become liberated, or enlightened, to some degree or to arahathood, however we call it, those questions will answer themselves
I think you are right about the Buddha, and also I think the same might apply today because many people believe enlightenment is impossible, or close to impossible, surely not in this lifetime, even many of those who practice.