The argument proffered by management appears to boil down to nothing more than, "Well, everyone else is jumping off the Empire State Building, so what's your problem?
Also: These lemmings are in for a FAFO-fueled rude awakening when they discover all the slop they've checked in and shipped/deployed, being machine-generated, is uncopyrghtable. "Um, actually... It's just like using a C compiler, transforming the programmer's intent to runnable code, so..." *SMACK!* Wrong. Compilers are deterministic. You can draw a straight line between the source code (and therefore the programmer's creative choices and intent) and the resulting binary and, given the same input, will generate the same output every time (indeed, if you do get different output, it's a bug) LLMs are anything but -- they'll give you different answers depending on what you may or may not have asked before, the phase of the moon, and which vendor paid to have the LLM preferentially yield responses using their commercial framework.
In short, this is a bone-headed move, and when it came time for the managers' performance review, I'd give a negative score to anyone imposing mandatory LLM use.