Let's take one component of Microsoft Office. Microsoft Word is seen as a tool for people to write nicely formatted documents, such as books. Reports produced with Microsoft Word are easy to find, and I've even read books written in it. Comparing reports written before the advent of WYSIWYG word processing software like Microsoft Word with reports written afterwards, the difference is easy to see; average typewriter formatting is really abysmal compared to average Microsoft Word formatting, even if the latter doesn't rise to the level of a properly typeset book or LaTeX. It's easy to point at things in our world that wouldn't exist without WYSIWYG word processors, and that's been the case since Bravo.
LLMs are seen as, among other things, a tool for people to write software with.
Where is the software that wouldn't exist without LLMs? If we can't point to it, maybe they don't actually work for that yet. The claim I'm questioning is that, "within tech, there seem to have been explosive changes and development of new products."
What new products?
I do see explosive changes and development of new spam, new YouTube videos, new memes (especially in Italian), but those aren't "within tech" as I understand the term.