In my day (....during the war....) sporting fixtures which needed a police presence had to pay for those officers. They were usually volunteers on rest days, so they had to pay the going rate for each officer at double time. Having said that, it only applied to officers deployed in the grounds. As an example, my local rugby league club (not a super league club) would fork out for a couple of officers for the duration of the match. Although, like many football and rugby clubs, they soon discovered that using their own staff wearing a dayglow jacket were much cheaper. Indeed some were volunteers, no doubt getting to see the games as their only recompense. Which is why on old football games, you'll see bobbies in helmets around the pitch, but latterly, only stewards.
So I guess the payment they are talking about levying will be for any officers outside the grounds, deployed for public order and traffic control purposes. Which I suspect will be a pretty big bone of contention. No doubt the sports clubs will argue that anything outside their premises isn't their responsibility and even if they do have to contribute, they'll want a say in how many officers are used, in effect wanting a say in operational matters usually the sole remit of the police.
Many a slip 'twixt cup and lip.