I dount that anyone is deliberately corrupt, but the system is rotten in the sense that it is slanted to favour the "big" teams. The PGMOL or whoever assignt he referees, is clearly a lot more concerned about getting decisions right at the top of the league than they are at the bottom.
Our clown Darren England being a case in point. He's clearly not competent to be a PL referee, and has only reffed 9 matches this season. Including 3 of Burnley's, 2 of Luton's, 2 of Brentford's, 2 of Forest's.
Furthermore, he had a couple of shockers on VAR early season. He disallowed a Burnley winning goal against Forest because the ball brushed Berge's arm and he judged it to be deliberate, and he disallowed a Liverpool goal for offside because he didn't know what the original decision was. He was taken off refereeing for Liverpool, because the PGMOL was concerned that Liverpool shouldn't get wrong decisions against them. But of course he is free to carry on creating mayhem at Burnley matches because the PGMOL don't care if he gets those wrong.
Corruption against Sheffield United? You haven't had England reffing you yet. You must have at least one friend in high places.