Maybe that's what they are saying. I could understand this wrong but high real estate prices locks up a lot of wealth in property where it isn't really doing any good. If all that wealth was able to circulate in the economy, it might increase growth.
You might argue that when I buy a house for $500k, the seller gets $500k, so where's the problem? But the seller needs somewhere to live too- they are probably putting that $500k into another house, commonly an even more expensive house.
That implies that all the cash is getting sunk into a new place, which is typically not the case.
Typically, I'm only putting 20% of that $500k down on the property. Now, to be fair, that $100k is effectively mothballed unless I pull it out with an equity loan or somesuch, but that's a far cry from freezing $500k.
You might argue that when I buy a house for $500k, the seller gets $500k, so where's the problem? But the seller needs somewhere to live too- they are probably putting that $500k into another house, commonly an even more expensive house.