Yes, it's not very clear at the moment, and I was thinking of ignoring the whole nonsense and just continuing doing as I have for the last 20 years here.
However, say that you get to 2029, five years after the rule change and, not having heard anything from the TRD, or having had any problems with Immigration or anyone else, you assume that all's well and you're in the clear. Then, suddenly, you get a demand from the TRD to file tax returns for the last five years and bring all your supporting documentation to discuss your tax position with them. Depending on your personal situation, you may be in the clear, or you may get hit with having to pay five years in back taxes, plus penalties and interest. Does anyone really want to risk that?
Personally, I think the safest route is to carry on as usual, and pay an accountant to file a tax return in the first quarter of next year. At least within a few months you will know exactly how your local TRD office is applying the rules and how much you will be on the hook for in future years. It may be nothing, or a trivial amount, but surely it's best to know exactly where you stand rather than imitate an ostrich? Then you can decide what you want to do: grin and bear it, spend less than 180 days a year in Thailand, or move elsewhere that's not signed up to CRS.