Certainly not yet. Some are getting very carried away by a decent return for a good side in a shit league.
He's young, so that obviously counts in his favour as he might (although not all players do) keep developing. Purely on stats though I found the following
16/17 league one season, James Vaughan 24 goals in 37 (one every 1.54 games)
18/19 league one season Josh Maja 14 goals in 22 games (one every 1.57 games)
So basically he's currently doing what James Vaughan has done, a player utterly useless in the Championship. Tin hat on, if I had to choose I'd probably take 16/17 Vaughan ahead of 18/19 Maja because, in addition to his similar (slightly better) goal ratio, he has more of an all round game.
This isn't meant to be critical of Maja, but some very average players have done what he's doing thus far. He's not doing so well in a shit league that we can predict premier league success! For me he's better staying here, playing, developing his game and seeing how far he can go. His choice obviously but if he goes I doubt he'll make an immediate impact on a higher league so getting regular football might not be easy