I'm pretty sure they blew through most of their estimates.
The projects was always hailed as one of the big crowdfunding break and nothing indicates they considered borrowing to finance the project given the massive amount of money they got and the time estimates they posted.
It would be irresponsible to operate entirely off of crowdfunded cash because that money could go a lot farther if properly invested. If you invest, then sometimes you need more cash that you have on hand. You could sell some of your assets, but if you can reliably anticipate they'd sell for significantly more at some future time (relative to interest rates), then you're better off taking a loan and then paying it off when you sell assets later.
Apple takes out loans in the US because their offshore billions are subject to 30ish % corporate tax if repatriated, which is indeed a tax incentive albeit a perverse tax dodging one...
The projects was always hailed as one of the big crowdfunding break and nothing indicates they considered borrowing to finance the project given the massive amount of money they got and the time estimates they posted.
By all means, check for yourself.