Kind of true, kind of not. The 1997-2001 Knights squad was as good as any for sure, but it was all down hill from there. By 2006 the Knights team looked like a team of reserve graders for the most part. For every Johns, Buderus and Simpson you had 2 Abrahams, Tolars, Chris Baileys, Luke Quigleys and Riley Browns. Despite that, while Johns was on the field they were still thought of as a threat for the title. The difference he made was clearly evident whenever he was injured - which was often unfortunately. 2005 showed just how influential he was as much as - if not moreso than - any year when the Knights had success. There is some validity to the argument, although it's obviously disingenuous to claim that Johns didn't play with good players. He had some fantastic support around him at times.
Personally, I don't care much for these lists. You're never going to convince a majority of NQ supporters that JT isn't the GOAT, ditto Knights supporters. Once you get to the very top echelon of players opinion is always going to sway with bias. When I was younger and stupider I would argue tooth and nail about this player being better than that. As I've aged I've come to just appreciate watching these players do what they do. I'll leave it up to others to worry about who was objectively the best, if there even is such a thing - especially when comparing different eras (and this list covers 2 eras for mine).
What I will say about this list though is that Inglis is a bit too high, and that Brad Fittler always gets a raw deal in these kinds of discussions. During that turn of the century era there were only 2 players I really feared playing against the Knights, and they were Darren Lockyer and Brad Fittler.