Mesh routes are really anytime two receivers run routes crossing within a yard of each other for the purposes of creating a legal pick in man to man coverage.
But like a lot of teams in goal line, the Bucs weren't in straight up man to man. They played a zone match scheme where the two defenders to the left side of the field were responsible for playing man coverage on the receiver entering their zone.
So while Shakir was in position to create a natural pick on LB White, who maned up Kincaid as he ran through his zone, the outside CB was never going to follow Shakir out of his outside zone. He covered Shakir man to man until he exited his zone, which allowed him to maintain leverage on Kincaid and apply man cover technique as he entered the outside cb's zone.
Nobody was getting open on that side of the field with take call and that defense.