As far as I know, there have never been set limits for entering Thailand by air, but they enforced a rule a couple of years ago limiting land border crossings to two times.
The article goes on to say that when it comes to Visa-free entry:
"The immigration office, they do not have a specified number as to how many times you can enter," Mr Naruchai told the vodcast. "You can enter as many as many times as possible within a calendar year."
It sounds like they've waived the two-times limit on land border crossings.
If someone with a previous Non-Imm did a quick border run today, and received 30 days entry. Will that person be qualified for 60 days covid extension before March 26?