This is a crazy thing to say. Document consistent success, but it's still only luck?
Poker is definitely a game of skill and knowledge. Luck is a short-term thing. If I play a hand where I's a 4:1 favorite, I'll win most 80% of the time. But you might get lucky and win a big pot 20% of the time. But even that's not luck, because your 20% win is predictable. In the long run, win percentages at showdown are pretty much etched in stone predictable. But beyond that there's the skill of pot-building, hand reading, being able to fold when you're beat, etc.
The only way poker is a game of luck is if everybody played every hand all the way to the river. But even then, eventually, we'd all come out even.
Poker is math, pure and simple, with a good dose of psychology and discipline on top of it.