You may have nailed it. From the progression of photos it appears that both mains blew. That says to me that the pilot stomped on the brakes and expected the antilock to keep from flatspotting the tires.
Here's the first pic in the series, and already you can see both rims are on the runway.
Not necessarily a failure. The way most anti-lock brake systems work, if the pilot got the wheels completely locked BEFORE touchdown, they would stay locked on landing, unless the pilot released the brakes and re-grabbed them.
If he stomped the brakes, the airplane would be noticeably nose-down, eh? And why didn't the nose gear tires flatten as well. By my view, not too much weight on the front tire at all.
Doesn't look like the rear struts are fully compressed, so it doesn't appear to be a particularly hard landing.
BE nice to know what really happened here.
Lemmee take that back. The rears are really compressed. I'll vote for hard landing that blew the rears.