Absolutely... that's what every other director in the country has to do... repay their company loan in lieu of cash for their wages. It's pretty simple really and not like he couldn't spare $50-$100K each year to get it paid off over a few years.
It's plain and simple really... he's just being DODGY not wanting to repay it. In the first instance, my money is on him trying to forgive his loans if he can get away with it, and in the second instance, he'll only repay it if TNG actually takes off.
No doubt we'd all happily receive millions of shares in TNG if we didn't have to fork out any upfront risk capital for them...
This sort dodginess with loans is really pushing the (legal) envelope imo.
A quick email to TNG's auditor from concerned shareholders is perfectly ok (don't expect much of a response though) and would absolutely ensure that the position/treatment of the loans is heavily scrutinised. No auditor can ignore reviewing shareholder concerns without putting their head on a chopping block if something ended up being wrong.