Did you miss the part where GP was proposing price controls?

In response to what is deemed to be unreasonable and/or undesirable landlord behavior ... such controls would not stop landlords from continuing to earn from their properties.

"Unreasonable behavior" is just "setting market prices."

Correct it wouldn't stop landlords from continuing to earn from their properties but it would destroy the incentive to produce additional housing, so nobody wins.

Not everybody who buys a home is a landlord.