It is highly unlikely that they will have put a personal guarantee to this, it just isn't standard for this level of financing. The Allams would be completely against it as well, as it makes no sense for them to transfer the debt from themselves to a bank but still be responsible for this debt.
Secondly, it isn't hard at all to find a bank to do this. The bank I work for would do it in a second, I am not saying whether that is right or wrong, but having underwritten similar but different deals (Not the football industry), all the bank cares about is the security.
The Premier League money is flawed security because it can be withheld from the club under the rules. Something acknowledged by the bank in the debenture. Its not like real property or even book debts.