It’s been a re entry requirement to the US since January! There is no Covid testing requirement to get into Mexico. Just someone trying to start another even more irrelevant debate on Covid. This thread should be removed from this forum and put in a US travel thread.
How do you find it irrelevant to Cozumel when it affects 90% of Cozumel tourists? That January re-entry requirement was discussed in many threads in this forum and no one had an issue with that. This is a significant modification of that re-entry requirement. It reduces the three day pre-flight window to one day and adds a second test after return.