To be fair, there are plenty of examples of it exploding after touchdown in the early days (of landings), both on the barge and in the water, some which are pretty spectacular looking!
It may not meet the technical definition of an "explosion", but the fact that it's still intact here is a testament to how "soft" this hard landing was.
There's lots of great videos to prove you wrong on that one, actually.
The most dangerous time for a can of gasoline is when it's just been emptied- because it's actually full, just of air and gasoline vapor. It's a bomb at that point if you aren't careful. Rockets? Similar problems.
Rockets contain both fuel and oxidiser, explosions when they are full are considerably worse than when empty. Compare the video you have linked to clips of Atlas or Soyuz blowing up on the pad.
It may not meet the technical definition of an "explosion", but the fact that it's still intact here is a testament to how "soft" this hard landing was.