I'm no expert, but a couple of points. Firstly the Balance Sheet is at a given point in time, in this case 30th June 2023. It's already 7 months out of date. We don't know how much the club owes now. In any case, as the Balance Sheet shows what the club owns (it's assets) and where the finance came from to pay for those assets(the liabilities), if the owings are not being claimed immediately, or in the near future, there is no issue.
Secondly, it is a not a statement of profitability. That is shown in the profit and loss account which reflects a period for a year leading upto its date of production. Sustainability is different to profit, although any business would need to be profitable in the long run, whenever the long run is.