I never get people who aren't grateful for pointers. Being shown which direction to walk is of no value, they must also be carried there.
They didn't claim to save work, they claimed to save hitting a bug, and having to debug it.
They said the word "vararg". They gave you everything.
They are not some professor in my school, some valued colleague, or known kernel expert. They are a stranger on the internet. No, I can't be bothered to research every person that claim to have some wisdom that they won't articulate to cultivate an air of mystery.
They gave me everything to dismiss their claim.