I've read those arguments you link and they always seem to boil down to thin self referential definitions and using synonyms as if they're explanations.

"For example, my concept of phenomenal 'redness' is grounded in the phenomenal quality of redness that I experience"

you might as well say that my concept of wibble is grounded in the wib quality of ble that I experience. it shares the same level of insigtfulness.