Believe it or not, those arent catastrophic as it would seem. I was amazed, but thats what its meant to look like when the blast-door setup does its job I'd figured it was more of an ERA-tile thing, but instead its a huge inferno on the tank that leaves the crew compartment untouched.
There's a vid showing what happens internally.
Most of what you see falling all over is debris and residue/leftovers from the ammo cooking. There's a big discussion on Tank-net about it, and the lack of fire from certain areas you'd see from a full-on internal fire. Plus the fact it burns out pretty fast comparatively, rather than a continuous fire you'd see coming from the crew compartment hatches and all.
Not trying to defend the oddness in penetrations of course, as none of those hits in Antaress' pics seem likely to have left the crew unharmed realistically. Definitely an oddity there.