Yes, labor is how wealth is produced, but in a sense, an individual's labor is more than that: a person's unrealized wealth is the discounted future value of their lifetime income minus necessary survival expenses. That's not a constant number - it depends on the individual's choices, but nevertheless, that is some number. And that number has some associated optionality.
If we increase the price of houses, the optionality associated with that future stream of earnings decreases, and therefore I believe that wealth has actually been transferred (since the optionality of the homeowner increases)
Economics is the study of scarcity. Wealth is real stuff like the house.
"Unrealized wealth" or "The potential to create wealth" or "the future value of your skills" shifts around, sure. Not the same thing as actual wealth though. And these shifts of theoretical outcomes are not transfers of wealth. This sounds like straining to fit something to emotional language.
...as Marx made, yes. And he was a pretty sharp cookie, so maybe the argument is correct.