All 4 One was a legit R&C game. If it wasn't, than neither is Deadlocked or Secret Agent Clank.
However, this game will play more similarly to the original trilogy and the Future trilogy, which is what I assume you're asking.
Eh, arguing the legitimacy of R&C games isn't an exact science... I think DL, SAC, and A4O are legitimate R&C games, anyhow. They meet my criteria of being made by Insomniac or High Impact Games.
Let's just agree that Going Mobile isn't legit.
I thought TC meant if this was canon lol....
Well, if that's what he meant then yeah, this game is canon. And so was A4O. There aren't any (confirmed) non-canon story materials in the R&C universe aside from the manga. --- "Ahhh...... You look like a bear wearing a marshmallow."