There were some viral threads going around for a bit that were focused on this word. It never made sense to me - presumably an LLM that outputs the word delve does so because it learned it from the data it was trained on, meaning delve was already a common word.

I personally have used the word for many years, and have seen it extensively pre-LLM. To me, it’s only a red flag when someone starts producing content that doesn’t match their prior history of writing with a sudden explosion of vocabulary.