I'm glad I wasn't the only one. I was very confused for a moment after reading that comment. Never seen the acronym "SF" used for science fiction before.

https://google.com/search?q=SF+writer doesn't list writers from San Francico

SF straight in the title of https://www.amazon.com/Other-Worlds-SF-Human-Imagination/dp/...

SF also serves to include both 'science fiction' and 'speculative fiction' but that's a whole other debate

I've seen it a lot, and the first use of SF was naturally right to me. That's why the second one was so confusing.

It took you for me to realize that op didn't mean San Francisco. It made sense for me either way.