The problem is the FDA doesn't have the authority to test the claims of supplements. They only regulate if the products are adulterated or misbranded.
https://www.fda.gov/Food/DietarySupplements/
If the FDA was in the business of regulating claims then we wouldn't see all of these "miracle weight loss cures" or "anti aging pills", right?
Pure protein has 4 calories per gram. It's not possible for "different types of protein" to have less than that.
http://www.dining.ucla.edu/housing_site/dining/SNAC_pdf/CaloriesCount.pdf
Here are the details of the lawsuit, it was just finalized December of last year
https://www.leagle.com/decision/infdco20171213e89
Some key points of the lawsuit:
SI03, Inc the makers of Syntrax sued MuscleGen the makers of Genepro over the claims that
"MuscleGen markets its GenePro product by falsely claiming it contains 30 grams of protein in a roughly 11.15 gram (1 tablespoon) serving when GenePro has 10 or fewer grams of protein per 11.15 gram (1 tablespoon) serving"
"GenePro's marketing and packaging statement that it contains "medical grade" protein is incorrect, false, and misleading, as no industry or FDA standard for "medical grade" protein exists."
Genepro did not even bother to respond to this lawsuit or show up in court, a default judgement was entered in favor the makers of Syntrax, against Genepro
Since Genepro didn't even respond to this lawsuit, is it surprising they haven't taken down the claims the court deemed misleading & false? This is a civil lawsuit, the government plays no role in enforcing the judgement.