I could send you paper and paper that wealth/income and stability increases happiness aggregated.
I could send you papers that would show that sending people scientific proof doesn't convince people and that wouldn't convince you.
Nobody disputed that. You made a statement about "something only someone with a high income would say." That's drawing the generality to a specific. It would be like concluding from the fact that most dogs are black, brown and white, that every dog is black, brown or white.
In this case, it could absolutely be the case that the factors that cause money to turn into happiness are not present among FAANG employees to a greater degree than population.