That's exactly what it is. I remember dismissing 911 conspiracy theorists because it was just so absurd to fathom. I never got to step 2, "can jet fuel melt steel." That's a pretty basic question with a pretty straight forward answer. The whole thing reminds me of the below corrugated plate illusion. Once they flip in your minds eye, you can't really go back to how you saw it before:

https://www.thehits.co.nz/the-latest/this-viral-plate-illusion-has-the-internet-completely-divided-which-way-up-do-you-see-them/