Yes, when Nebraska had Spielman, Washington and Mills were at Nebraska, he was the 3rd leading rusher because Washington was dismissed from the team after 7 games. Robinson had 3 games where he had extensive carries
Illinois 19 carries
Purdue 22 carries
Indiana 14 carries
In the Purdue and Indiana games, Washington wasn't on the team, and against Illinois, Mills had 12 carries, Washington 10, and Nebraska won the game.
In the 7 other games Robinson played in 2019 he averaged about 4 carries per game, for reference, Otis Anderson the FR Wide Receiver for UCF in 2017 averaged 5.75 per game. Without Washington, his carries increased. In those 7 games he and Spielman averaged about 4 receptions per game. So for the first 7 games, he was just another guy.
In 2020, with Spielman gone his production went up in part because Manning couldn't get on the field, Betts was only a partial factor and the WR core was basically a bunch of walk ons. Again the 5.75 rushes were equal to what Anderson had at UCF. McCaffrey, Martinez and Mills had the bulk of the carries.
In 2020 there was few if any options at WR and the QB struggled to throw the ball further than 10 yards downfield.
Based on his numbers in 2019 as a freshman and his numbers in 2021 at Kentucky, he is fine just being another option. Over the course of his career, when Frost has had multiple options at WR and RB he has used those options.
Believe what you want.