so, when you hear people call themselves communists or socialists, or leftists (i'll accept "progressive", because it's a fundamentally conservative and fundamentally capitalist label), and then argue for market liberalization around prostitution...
i wouldn't suggest doubting their commitment to the marketization of sexual intercourse. they seem to be making that point crystal clear.
just don't let them pull the wool over your eyes, and try to trick you into thinking this is a philosophy of the left.
look them in the eye and call them the ancaps and neo-liberals that they really are.