You're going into details that we don't know if they're applicable in this case. Still, I don't see the point, especially since the loans for the majority of the construction were secured. Either way the club owes that money plus interest. In my opinion, it is best for the stadium to start operating as soon as possible and begin generating revenue. Additionally, this stadium is a huge asset that could eventually be sold to cover the obligations. Getting a massive loan and abandoning / delaying indefinitely your investment plans is far worse from a financial standpoint.
Valencia did something similar to what you suggested, and it has not been going well for them for over 15 years already. But they are lucky to be playing in an inferior league and have avoided relegation numerous times.
Valencia’s Nou Mestalla ‘ghost ground’: After 15-year delay, will it finally be built? - The Athletic