Perhaps devoid of machine learning, given the year, but even that seems unlikely if the anecdote is true.
If predicting and planning outcomes and with previous data is not some form of AI, what is?
Agreed on the valuable ERP thing, though. There’s a reason SAP is as expensive as it is.
Algorithmic forecasting.
If you squint really hard, the entirety of computer science falls under "AI". But practically speaking, today AI refers to ML.
It's quite possible a savvy programmer integrated the weather forecast to the ERP, with specific products tagged as relevant to a sunny (or wet) outlook. That's not AI, that's just an algo.
It's also possible there was ML at play, but that's not clear, and not necessarily the case.
But it shouldn't and it won't.
AI is a pretty useless name, anyway. Since no two people will agree on its meaning.
Anyway, I doubt people tagged what products are most sold on good weather. That's the kind of thing that is almost always discovered by statistic analysis. (We call some statistic analysis "machine learning", while others that do the exact same thing we don't.)
I simply don't think a hand-designed decision tree for a specific task can be called AI.