Nobody is saying “Linux is obscure”

How about scrolling up to the exact comment I anwered to? Or -as you seem to be on the exceptional dense side- let me do it for you…

Linux’s “security through obscurity” was never going to last.

As already explained above I did not expect that statement to use the common “long-standing industry term” because -again- it would be utterly insane to claim security through obscurity for something open source.