https://pubmed.ncbi.nlm.nih.gov/9730026/#:~:text=Totally%20b....
Ah!
Since when? Last time I checked they're selling real meat from animals that lived in an absolute horror show for their short life, which came to a close in the slaughter house where they're drowned in CO2.
Show me a single article which reports with proof that McDonald's accepted this kind of meat at scale.
You won't find it because they don't have to. They're paying cents per pound of meat because the meat industry has gotten extremely efficient at producing it.
Animals are artificially inseminated whenever they're not pregnant using sperm provided by a lab, fed soja and corn to maximize growth etc.
There are a lot of issues with the food, but the "meat quality" is likely higher then the stuff you buy at a supermarket.
You can literally go to court if what you claim is provable as they're making clear statements that its 100% beef. There are no asterisks on that, it is beef as defined by law.