I haven't heard that exact expression before, but basically agenda-driven speech, for commercial or ideological persuasion or whatever. See also: https://en.wikipedia.org/wiki/Motivated_reasoning

With cryptocurrencies/NFTs/etc. everybody talked them up because they are invested in Bitcoin or whatnot.

With LLMs, everybody talks them up because they are invested in Nvidia or have other exposure (which is almost everybody considering with all the datacenter building if this industry tanks US economy is also), or because they are invested in having jobs.