Comment by mindcrime

That example was added in 2022.

I'm very sure that using "learnings" in a way that is roughly synonymous to "lessons" predates 2022 though. It may have only been added to that specific dictionary in 2022, but the usage is certainly older.

"That's not English" is usually prescriptive, rather than descriptive. And though English does not have a central authority, individuals are very much allowed to hold prescriptive beliefs - that is how language evolves.

Very true. :-)