Loans are just part of the funding strategy of a club by the owner. Mansour put funding in as 100% but he has mucho dineiro. Some owners may prefer to loan money so it can be repaid easily if the club is in a position to do so. Some owners may prefer loans for tax reasons - favourable tax treatment for interest income compared to dividends, for example.
If an owner considers he can increase equity and reduce loans, he can convert some of the loans to equity (new shares) without putting more cash in (the cash was received when the loan was made). It is just a book-keeping entry, apart from some documentation and some minor associated costs.