This is incorrect. Stats sites are really lenient on the receiver. They only count a drop if it's a routine catch. The ball pretty much needs perfect placement and if it's in any way difficult of a catch they don't record it as a drop. Even if they get both hands fully on the ball, if they had to jump for it or have to outstretch for it or have to go low for it or anything... they don't record it as a drop. This is why you might see a receiver drop balls in game but then look at the stat sheet and see zero drops.