He is a 17 year old kid. The fans made him out to be next incoming of Fred Truman, Malcom Marshall and what not.
I agree he must be having a good record in domestic cricket.. and tbf when I saw him on debut vs Australia he looked pacy and bowled 145+.
But, International Test Cricket is no kids play, unless you are outrageously talented, which it is obvious this kid is not. He has the ingredients, but he is not a child prodigy as he has been marketed it to be.
Regarding the OP's claim, it was dig at the theory that Indians cannot produce fast bowlers...guess what our current lot are good and there are upcoming ones.. who have the skills and talent, and it will be polished in a strong domestic structure now.
Imagine those poor souls going through the toil and taking wickets day in and day out in Pakistan domestics.. and just for bowling few deliveries at 145+ this kid was put on pedestal.. and now he is been brought to ground.
So if he has mental strength and real skills, he will come back and I will be the first one to appreciate that.
Till then, he should keep his head down, and work on his skills.