To me it looked like he mushed into the ground either partially or fully stalled, and the last second wing drop adds to that impression as it may have indicated an incipient spin. I suspect he didn't have the altitude to complete the loop and upon pulling back to avoid the ground he stalled and crashed. What is unknown is whether, even if he had kept the wing flying by pulling out more gradually, he would have had the room to avoid the ground. It doesn't appear that he would have made it either way, though the video unfortunately doesn't show the aircraft at the critical moment in the pull-out.
I flew the A-10 and once was recovering from a low altitude simulated gun pass and misjudged my altitude. . .yikes. . .pulled back hard to the max performance tone (before warbling stall tone) but yet I was still in a sink and was nose high. . .but not stalled.
Pulled out below tree-top level. . .and when I had a climbing vector, I rolled over and looked at the ground, in addition to seeing individual faces of the British Army troops below me. . .I saw dust-devils swirling about in the dirt from my jet-wash and/or wingtip vortices's. Live and learn. . .