Sidewinder16
Footballguy
I don't think that tweet disputes anything Marvelous said.
What the tweet does say is that a Super Bowl winning team (going back to '94) has paid their top earning QB as much as 13% of their total cap. With the 2018 cap expected to be at least $174 million, a team could take a $22.6 million cap hit with Cousins' contract next season and not be outside the lines of that historical trend.
It also suggests, according to this, that Detroit, Oakland, Baltimore, Indianapolis, Seattle and Pittsburgh (so far) are paying their QBs "too much" to be able to make it to the Super Bowl next season.