data-is-favorited css attribute no longer available?

i see it being used in forum #132204, however i don't see it in devtools
is it not available for normal members? or is it no longer available?

It was removed almost two years ago in this commit. If you still need it for something you'll have to use a userscript to re-add it.

ah thanks. i guess i'll have to pull that data from the api (if i'm going to do it myself) then