They aren't required to report anything to anyone. There is no law requiring them to do so and they aren't going to do it voluntarily.
Here is my concern. If you arrive on a Saturday and leave on a Saturday you can get tested on Wednesday 72 hrs before your flight. If the hotel test you and you test positive they will require you to either quarantine with them or leave. Is there no second test to confirm it was not a false positive? So do you wait until Friday to take the test and lose only 1 night. Do you even do the test at the hotel? Or do you just get your results on the street? Of course if you test negative on Wednesday it’s a free for all the last 3 nights. Hum. Tough call.
The Antigen test produces results in 15 minutes, and they come to the hotel to do it. There will probably be someone there all the time. I am sure you can take as many as you like - just that the hotel will probably only cover the first one, and you'll need to pay for extra ones. Let's not overthink things. Everyone needs to remember it's not the hotel or Mexico that is making you do this. It is in the hotel's own interest and Mexico's to make this as easy, cheap, fast and unintrusive as possible. They are not the ones out to 'get you'.
My intent was not insinuate the hotel or Mexico is out to get us. Only that once you test positive at the hotel they will be required to do certain things. So is it better to test on last day or first day you can test. I guess that is really the decision everyone will need to make.
Hey, this might be a Positive (pun intended) thing for us. If we test Positive, we'll spend a few extra nights at Tempt, then take taxi to spend the rest of next 2 wks at Desire RM or Pearl in the Positively Degenerate wing along with other Positively Sexy Nakeds at $125/pp/pn...
A new twist on these requirements. Sounds like no clear details yet but I thought some might be interested. Quarantine After International Travel Now Required for Those Arriving in the U.S.
Here is the White House briefing on it Executive Order on Promoting COVID-19 Safety in Domestic and International Travel | The White House
