I agree with the max part. The most likely outcome is that we're never tested, just like the covid tests for bar customers a couple of years ago.
Of course, if Thailand actually passes such daft laws, it would be another area where the brown shirt mafia can accuse the bars of non compliance and then demand tea money.
Presumably they will lose the tea money from the bars which already open to 4:00 am, so a replacement line of business is probably desired.