Probably, if he sells and writes the loan off he gets nothing. What incentive is their to do that? Because he's a generous spirit...?
If he holds out, refuses to sell without getting his money back, technically he'd still be owed the money, obviously the club would be wrecked (administration? and relegated next season or points dedication this one and mid table, then relegated next one) unless the government allowed it to operate still somehow....
Point two might not bother him too much, given fans would blame the government at least in part and at least he has some chance, eventually to get some money back.
Either way, it's a better option from his perspective (unless he's father Christmas?) than simply writing it off. The Times are connected, very much doubt it's sensationalism, looks like there is a reasonable chance Chelsea as we currently know it will be a casualty of the war.