"Like" is a filler word I barely notice, along with lower key words like "right" or "uh uh". But the NotebookLM constantly exclaiming "Exactly" and "Precisely" stand out and are driving me a bit loopy. I wonder if you can prompt inject them away.
The turn of phrase "low-key" became popular in the 2010s - I barely, if ever, heard it used before then - so my guess is that this user is in their twenties to early thirties.