Actually, the nautiloid tanks dealing force damage is an illustration that Larian do not actually understand what force damage is or represents. Mundane objects - not even highly explosive fuel, let alone goblin hand bombs - should never deal force damage under any circumstance. That's not what force damage is. Force damage is, specifically, raw magical energy; that is why it's so rare, and why so little has any kind of resistance or immunity to it.
Outside of that, your video looked pretty much like an explosion to me. Had there been many people around it, and in the ignition, area they would have ALL taken the d4 of fire damage (and made associated concentration checks), from that one single cantrip.
For thoroughness, you could also post a video where you throw a firewine or smokepowder barrel onto an existing open flame.
