....the CONACYT keeps statistical data on "undocumented foreigners" and "deported American" (and, Canadian) citizens (Mexico's National Council of Science and Technology). Thousands of American citizens have been deported from Mexico, at least since 2015. So, the trail of deportations has been over quite a few years, and not just commencing in 2021.
What MAY be fueling all the "chatter" presently happening, is that Mexico never warned illegal tourists in Mexico in advance of the country-wide program to step up the "dragnet" activity (unlike Vietnam and Thailand had done recently, to catch illegal tourists in those countries). However, Mexican officials are giving some genre of 7 days for illegals to get their affairs straightened out before deportation.
https://conacyt.mx/
CONACYT