just to share my own personal experience entering thailand yesterday morning on 22 March after the new CAAT regulations.
i boarded my flight from Singapore at 7.15am SGT and reached Suvarnabhumi at 8.30am TH time.
SG airport is fully self check in, including printing of boarding passes and baggage tags. No checking of health certificate and insurance at boarding.
Reached bkk and handed my T8 form to health control officer without any health certificate or insurance. it was just my passport, boarding pass, immigration card and T8. the health control officer stamped on the boarding pass and immigration form and kept the T8 and i proceeded to the immigration counter and got my 90 days visa no questions asked.