What page is this "much like" quote from TLJ visual dictonary on? Can't find it.
Personally, I do believe that as of TROS, Kylo Ren is meant to be up there with the very best. But the quote, as it's quoted here, seems to be talking about Kylo as of the time he left Luke's new jedi order, so if we take it to mean parity with Luke and Vader, then that would suggest that Ren, as of the time he took out Luke's students, was already on par with Luke/Vader. In order to believe that, you'd also have to believe that TROS Kylo would stomp Vader/Luke, considering that, based on his and Rey's performance against Palpatine's guards and the KOR (both of which are probably superior groups to Snoke's guards), he is at a level where he would stomp even his TLJ self, who is years more advanced than the Ren who took out Luke's students.
^And does that sit well with anybody?
Here's a question:
Lets say you are a professional boxer, and you have an 8 year old son, who much like you, possesses great skill in the sport...would that mean he is on par with you at 8 years old?