https://theguadalajarareporter.net/index.php/mex-lifestyles/mexican-lifestyles/travel/55762-senate-beefs-up-laws-on-access-to-beaches
Did a search, found a few links, all from a year ago. Decided to post it anyway.
https://duckduckgo.com/?q=Mexico+Senate+access+to+beaches&t=hy&va=g&df=y&ia=web
"As of October 22nd, 2020 all beaches in Mexico must guarantee free public access to everyone."
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Be sure to visit www.lamanzanilla.info for more information about La Manzanilla Mexico.