This is the best advice. Burner gmail account + burner google voice number. Especially since all the craigslist deals I've successfully done over the last 2+ years have been exclusively conducted over text (using the Google Voice number). No calls or emails. That seems to be the most effective way to do business on CL these days.
Whenever I do that I get a few lowball texts that are easy to respond "no" to. Usually 1-2 of them then come back with a more reasonable offer, we go back and forth a few times, and then agree. Then the person comes and buys it. I've never had anyone back out at that point because I always advertise completely honestly, including the flaws. I've always ended up selling the item (including a car) to the first (and therefore only) person who made an appointment to come look at it, after the back-and-forth texts.