Do you believe luck exists in poker?

I stumbled upon an online article recently, which explained that researchers "proved" nothing is truly random, there's only cause-and-effect and probability, and the appearance or expectation of randomness is really just ignorance about the underlying probabilities of various outcomes (effects) arising from various causes.

To prove it, the researchers built a coin-flipping machine, and found that whatever side of the coin was up before the flip, that side landed facing up 90% of the time, apparently due to one side being slightly heavier than the other.

Yet among my circle of poker playing friends, there seems to be a unanimous consensus that certain players are just "luck-boxes". One older gent I'm friendly with actually stopped me to talk as we were leaving, and advised me not to play with anyone "lucky". Apparently some folks get AA more than once every 221 hands.

Do you think some people are just plain lucky at cards? If not, what's the rational explanation for why some players seem to always catch whatever cards they need to make the best hand?