Who has claimed that? Seriously, can you find me anyone?
Those of us that see something in his stats see that he has the potential to become good, based on the fact that his contributions have been very good considering his lack of play time, and they seem to come more in those little periods where he got some 70-90 minutes run outs.
I'd say that it's more like we're comparing Daka to Vardy in his first season here, before he got to play some regular football and show us what he was capable of.