In early Science teaching in the USA, say K-8 Fahrenheit is probably the focus. Starting in High school its more of a mix of F/C/K, and once at the college / university level it'll be pretty much exclusively C/K for science.

For a general consumption science article targeting an American audience it makes sense that Fahrenheit is used, because American's are used to it and its convenient for human temperatures. (More precision per degree, 0-100 is a common temperature range, mostly human comfortable).

Of course clearly including Celcius alongside Fahrenheit would make a lot of sense, I agree its strange that both were not included.