The engineers pointed out something that is well-known in the industry, but that was evidently ignored by Samsung: batteries need room to expand.
It doesn't matter if this fact is pointed out by hardware engineers, software engineers, or used-car salesmen. It doesn't matter what degrees or professional certifications they hold or don't hold. It's a consequence of fundamental physical laws, and it's very likely to be the root cause of the problem. Your arguments, on the other hand, amount to puzzlingly-irrelevant ad-hominem rants.
(The interesting question, by the way, isn't the fact that a few phones caught on fire. The interesting question is, "Why did Samsung see no alternative but to kill the entire product, bulldoze the factory, and seed the ground with salt?" That's really what the Instrumental engineers set out to answer, and I believe their conclusion is probably correct.)