I seriously doubt this. It could apply to nodes (like gates), but definitely not highways. There’s nothing in the wiki to suggest otherwise: Key:access - OpenStreetMap Wiki
“Access tags pre-eminently describe legal permissions/restrictions and should follow ground truth, such as signage combined with legal regulation, rather than guesswork. They do not describe common or typical use, even if the signage is generally ignored.”
" To indicate practical (un)suitability for certain types of cycles / riders do not use mtb=* (a form of access=), but tags as smoothness= , mtb:scale=* or surface=*"
Mappers using access tags for suitability instead of the proper scale tags (like smoothness, sac_scale, mtb:scale, horse_scale) really give me a headache. Local mappers used to argue over bicycle=yes/no, since what’s ‘suitable’ varies based on skills and perception—exactly why we have scale tags.
In Thailand, trails are legally open to all vehicles by default, regardless of their difficulty. So, any unsigned trails marked as bicycle=no or horse=no will eventually be replaced with the appropriate scale tag.