False. It gives you an time boost over people who not use it. Allowing you to get to end game and the good gear faster. There for it gives you an clear advantage meaning it's pay to win. How bigof an advantage that is doesn't rly matter. an advantage is still an advantage no matter how small.
First part is only half true. no everyone with characters below lvl 90 have no clue what's going on. I have plenty of below 90 characters and yes I hate the buy lvl 90 future. The second part is also not fully true. Just because people might not be interested in doing end game or leveling as quickly as possible doesn't mean that the don't care about the instant 90 future as it still gives people an unfair advantage to them and it also mean less people to enjoy before end game content with as they'll just mostly skip it buying instant 90's.
Very shortsighted and the wrong comparison I must say. ofcourse an instant 90 isn't going to have an advantage over another person that is already level 90.
Now take the next example though. Two guys challenge each other to an competition in which they have to get to end game and geared up as quickly as possible.
person 1: Levels normally using every way possible to speed the leveling up but buying instant 90.
person 2: just buys an instant 90 and is instantly 90 levels ahead of person 1.
considering it takes person 1 a week to reach 90 himself. Person 2 just bought himself an advantage of an couple of days over person 1. Which then means it will get into heroics a couple of days before person one. It will join a raid gear an couple of days before person 1 etc etc. Maybe not an huge advantage still an advantage non the less. there for pay to win.