I think you misunderstood the comment you are replying to? They are saying that PARC demonstrated OOP to the Apple team, not that the Lisa implemented it.
Implementing it would have to wait till NeXT and Objective C, which was quite (but not entirely) Smalltalk-like.
Implementing it would have to wait till NeXT and Objective C, which was quite (but not entirely) Smalltalk-like.