I have a forthcoming trip in April with XiamenAir from AMS to BKK with a transit in XMN, with a return one week later.

Although I am going to a different country I just have a query with regards to the Singapore DoH saying that transit passengers are not considered as having travelled to mainland China.

Firstly, having transitted in XMN before you have to exit airside at arrivals, go to landside and then return to airside in departures. And secondly, if the transit it more than 4 hours (which I have on my return journey) then I can use the XiamenAir hotel in the city. The first case is mandatory but I assume still not classed as travelliing to mainland China since you do not need to exit the terminal building. But the second case I guess now is not allowed, as before you can go into the city for a few hours. So would the Singapore DoH refuse entry if a passenger went into a Chinese city during a transit?