well i won't go so far as to shit on you but those people years ago were mostly correct and the people today saying a blackbelt in BJJ means nothing are almost entirely incorrect.
Since it's sherdog everything is seen in absolutes. If belt color isn't a PERFECT predictor of MMA grappling success then obviously it means NOTHING and has no value. what nonsense. No, it's not a perfect predictor. There are plenty of examples of lower belts subbing or outgrappling higher belts (mackens semerzier x wagnney fabiano, Kevin Burns x Roan Carneiro, Matt Wiman x Paul Sass, etc.) But there are way, waaaaayy more examples of higher belts doing just what you would expect to lower belts, i.e. dominating the lower belts on the ground and submitting them.
there are in fact belts for no-gi grapplers depending on the instructor.
also i don't understand all the hate directed towards BJJ instructors and gym owners, imagining them handing out belts to the most subservient, well-paying students. I've never known this to be the case and unlike most traditional martial arts BJJ has high intensity sparring and full-intensity competitions. It's very hard to promote your students to belts they do not deserve because they will get crushed by the first blue belt (or D1 wrestler) who visits the school, and then the jig is up.