I don't think this is about Covid.... it is meant to be a free to the public beach......
It is what happens in Thailand, free space with foot traffic gets acquired. Even in the Malls, the car parks get taken over by market stalls and little shops spring up inside, making the walking space cramped and seating difficult to find.
Hardly surprising, I hear rule enforcement in Jomtien is loose, they make Pattaya police look positively conscientious!