Earlier quoted context omitted.
then the stock should be at $3 instead of $300 if insolvency is such an issue. obviously there is more than meets the eye here. or this is the short of the decade, more than even 2008.
In my general experience, bond traders tend to be a savvier (if more jittery) lot than stock buyers.
So yes, they are probably more savvy than the average equity investor; the bonds falling doesn't mean they think a default is neccessarily on the horizon, just that a ratings upgrade is not (and potentially also that the company will come back for more money sooner rather than later, as that implies more supply vs demand which may not scale equally).
This would all seem to make a good case for the equity being overpriced, but to short the equity you need a conviction that the rest of the market will realise this sooner rather than later.