There’s a myth out there that a specific type of sorting/categorization of words called “latent semantic indexing” or ( LSI) keywords that Google sees as relevant to each other. The problem being LSI keywords don’t exist:
There's no such thing as LSI keywords — anyone who's telling you otherwise is mistaken, sorry.
— John Mueller is mostly not here 🐀 (@JohnMu) July 30, 2019
So if someone is pumping up their SEO by talking out their LSI keyword program? That’s a buzzword signaling to run for the hills.