It's standard Daily Mail stuff.
They take 2 'facts' and then merge them together to make a headline:
1) Sheffield United have missed some payments.
2) Sheffield United must pay players their promotion bonus.
"Doubts Emerge over Bonus Payments for Sheffield United Players as Club struggles financially"
Expand on what this would mean:
"Football Experts have said this would be the first time this has happened in League history, it will be a problem for team morale - and could lead to a player strike, or contracts being cancelled and a possible points deduction if these payments are withheld"
Then pretty much dismiss everything further down the article:
"A spokesperson for Sheffield United dismissed these claims and say all payments will be met"