It isn’t conflating the two, IT isn’t just Office.
It is in this instance, seem as we are talking about a vague term as "Advanced Microsoft package skills is an absolute must" on NMW which most people apart from some failed gotcha's have understood to be a basic admin role.
The true skills needed go beyond this, from decent PowerPoint through to more advanced Excel/Access - this then pushes into basic programming. I have a young staff member who is struggling to use Excel beyond SUM, presumably because they don’t learn beyond that.
Considering the wide arch of IT, you are displaying why these job descriptions arise. You seem to want someone to have a decent knowledge of Powerpoint, advanced excel and a basic programming language, even though in most jobs they are clearly separated, unless you are talking general 1st line IT helpdesk which is understood worldwide to be learn on the job and to tie into business requirements?
You are never going to teach everyone to be competent across the wide sectors that you have highlighted as the teachers would have a nightmare every 2/3 years.
The IT shortage is not in teaching a specific product, very basic things like SUM, bold etc is all thats needed, its CS based.
Unfortunately if schools don’t cover this employers need to stump up the cash for courses or more time with management to learn. Most employers don’t want to do this so insist on experienced/trained staff.
No they don't unless its very specific, it will be following defined processes and with regards to the OP and past knowledge, will require pushback on IT wanting to upgrade to the newer standard because they don't like change.
TL;DR yeah you are trying to conflate the IT shortage to general office products. That is not where the IT shortage gaps are pointing to as it's entry level stuff.