I've always had issues with that phrase, mostly because I'm a huge fan of sci-fi and have never been able to figure out how someone can 'know' about alien species or other planets or tech that doesn't exist.

I know, I know… it isn't meant to be taken literally. More like If you like sci-fi and read a lot of it, write sci-fi

I like sci-fi. I read a TON of it. If I read 200 books a year (not unheard of) then 100 of them are sci-fi related.

My point?  Apparently nothing I actually write qualifies for sci-fi.  Go figure ;)

(NOTE: this is said with tongue firmly planted in cheek. Do not take literally)

(Silly monkeys…)