The definition of luck is random chance that comes out in your favor. You have no control over whether or not your opponent sees a blunder or makes a blunder. It's a dice roll. It's the definition of luck.
If there were no luck in chess, then the better player would always win.
Anyone who doesn't think there's luck in chess is just wrong.
Sometimes you hang mate in 1 and your opponent doesn't see it. Who knows, maybe at that particular moment your opponent just wasn't paying very close attention. Sometimes they would see it, sometimes they wouldn't. You have absolutely NO CONTROL over whether or not your opponent sees it, so essentially it becomes a roll of the dice, and if your opponent doesn't see it, you're not good, you're just lucky.
Ah, but you say that is only at lower ratings. Wrong. Bronstein was dead lost against Petrosian in the 1956 Candidate's when Petrosian inexplicably hung his queen. 999 times out of 1000 that never would've happened, but Petrosian had a brain-fart, pulled a Botez Gambit, and resigned. Bronstein was lucky, pure and simple. He was outplayed and he was dead to rights, but he won because Petrosian did something that even most players rated 1000 points lower than him wouldn't do.
Is there a lot of luck in chess? No. Is there no luck in chess? Don't be ridiculous.