[morjom]

Don't "regular" dictionaries like the Cambridge and Oxford ones usually avoid adding slang?

[dragonwriter]

The OED may take a while to add words sometimes, but it doesn't avoid slang; it aims for completeness rather than limiting itself to a particular formal register.

[cjs_ac]

The second paragraph of the article:

> Delulu, tradwife, broligarcy, and lewk, have all been added because experts believe the words will not be just a fad, but will have linguistic staying power.

[lucideer]

The fact they've included that paragraph doesn't invalidate the question. Cambridge used to add ~500, maybe as many as 1000 words annually. In recent years it's climbed to 2000 but 6000 is rather unprecedented.