Earlier quoted context omitted.
Just to make sure we're on the same page, by "free-market-leaning" I mean opposing government regulations in markets. Advocating for some regulation is generally not considered supportive of a free market; on the contrary, that's just supportive of a market.
That’s what I thought you meant, and I think that’s a mischaracterisation of the group in question and of those more generally who say they’re advocates of free markets. Are any of them not against slavery on the basis it’s unfree? (based on your definition) Small or limited government is usually the given position, vague as that may be, not zero government.
If someone is telling you that they support free markets and they also support government regulation, they don't understand what they're saying.