Do I need to meet entry requirements for a 10-hour layover in Bangkok if I'm not entering Thailand?

A traveler has a 10-hour layover in Bangkok en route from Vietnam to the UK and is unclear about the entry requirements. Comments suggest that if their luggage is checked through to the final destination, they may qualify as a transit passenger and avoid the full entry procedures (e.g., ThailandPass, hotel reservation, insurance, PCR tests). However, if they need to collect their luggage and check in for another flight, they will have to comply with the entry requirements.