I can't confirm this, but logic dictates that if you're in D status or later that parts have been allocated to your order already. So if you're in D or later, any part shortages should not affect you. C status is going to be the 'sweet spot' where you've received dealer allocation but are awaiting parts/scheduling to be available to bump to D. So if you're in C status, this is likely directly affecting you.

Again, though, this is just a guess.