The term info. Arch. I believe comes with a lot of ambiguity in the sense that 2 people talking about practicing IA might not be talking about the same thing. Mostly we use fragments of it.
Do we know what all it encompasses? And why should we even care? I believe if we know at least how broad or narrow the term is then we as designers can share this information and present a better case for ourselves to product owners/ other stakeholders.