Data point about the Amex “The Centurión Lounge” at MEX, as there has been a change since I last was there, not sure when exactly.

MEX is supposed to have three Centurion Lounges (maybe the most of any airport worldwide), two in Terminal 1 and one in Terminal 2 (according to Amex own app)

The Amex app still show the Terminal 1 location to be landside, pre security, between Gates G and F1, where indeed was last year, however they have at some point since closed down the entrance pre security, and opened the door and reception airside (I believe there was a SPA set up where now there is the Reception).

Not sure if the other Centurion Lounge at T1 domestic (gate 17-18) is still open, but again the app thinks so and I do not think it is mentioned in the wiki post.

I also visited the one at T2, which I believe is considerably bigger than the one at T1.