The problem isn't that the Zhangs are at fault, the problem is that they're indeed useless.
They relied on strategic CHINESE deals (from Korea, Japan etc) to get sponsorship money into Inter and made some shady (?) deals with other Chinese companies to transfer funds between them, I assume to get it international "approval" as it had to turn into Euros or Dollars for the transactions to take place. Now that China has blocked all this, they have nothing.
The "autarky" business model can no longer work with the Chinese because it never was a thing in the first place. We had injections from Asia that are no longer here and the only deals these guys can get in touch with are crypto scammers who're involved with the Chinese because of their shady Hong Kong domiciled businesses.
The Chinese have enemies, they have people that distrust them and they're an economic red flag. A fund on the other hand has a ton of people that wants to suck their balls.
People whine about Moratti, but the financial situation in the 2015-2019 period was much more favorable than the 2008-2013 period and I trust he'd do much better than Thohir and Suning combined if he was in charge (provided that the damage from 2008-2013 wasn't irreparable). And if the shares were magically given back to Moratti from Suning in 2020, we'd be in a much better financial state now. There'd be more trust to the Inter brand. Now there's barely any, it's on autopilot and people are still very suspicious. Our exposure to China is unparalleled to anything in top European football. Not even Abramovich's Chelsea was as exposed to Russia, not even to the slightest. Ours is tenfold, or more.