He had incredible athleticism and flexibility, certainly, and his ability to read plays and anticipate was world class.
One key teachable elements of his game is understanding the difference between (a) the space between the puck and the corners of the net, and (b) the space between the shooter’s eyes and the corners of the net.
Most good goaltenders understand (a) although Hasek’s understanding of the vertical component was a key goaltending development.
Most goaltenders do not know how to manage the distinction between (a) and (b) well, and I can assure you that nearly all shooters and TV commentators do not understand the distinction. The number of handshake lines I’ve been in where a shooter tells me how lucky I was because they missed a wide open net is a large number.
When TV commentators call Hasek lucky it’s because they’re typically not understanding the distinction between (a) and (b), and when they say on TV that Hasek is lucky, that’s how viewers decide that as well.