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I knew of the other usage, but I did think "but they didn't have liquid oxygen 8000 years ago!" when I saw the headline.

I really only know of either usage because a Bond movie I saw as a kid had the villain disguise his order for liquid oxygen as smoked salmon. Or something. Recollection is a little hazy.

I think the joke was that Bond is such a gourmet that he is the only one in the room who knows that "LOX" means smoked salmon.

That sounds like something in an Austin Powers movie, not a Bond movie.

Yep, this is the only thing I've heard it used for too.

I think of cre-lox recombination

https://en.wikipedia.org/wiki/Cre-Lox_recombination

Indeed, when I saw it used to refer to the fish I thought it meant liquid oxygen was somehow used in its processing.