I did think this would happen last year, and said as much (from memory in the Liverpool thread on the other forum in response to some reds saying we'd be in big trouble).
Essentially he runs the debt up to himself, and when the moment is required just turns it into equity and shows as an investmment into the company thus providing cash flow.
I'm not sure how it counts on the balance sheet, if they would count as an increase of +£250m and a big profit, and if it does would be be legitimate for FFP (it should be, and I might even suggest in a court of law it would hold up).
At some point moving forward, I wouldn't rule out someone taking out a minority of Moshiri's shares. Maybe Usmanov, but probably more likely a friendly Chinese investor. Again you run up a debt, and when you want the capital in, you just dilute and repeat the process.
I don't think this will be primarily for transfers. I'd imagine it is for the stadium, and satisfying lenders that we dont have that debt.