[Camillo]

The grammar _is_ wrong. It should have been "We found the 'an' neuron in GPT-2". Given the article's contents, it's hard to believe that the authors would make such a mistake; it was probably done deliberately, as clickbait.

[QuadmasterXLII]

I'd call it a pun

[moffkalast]

I'd call it an pun

[Rioghasarig]

I think it was deliberate but just as a joke.

[sebzim4500]

Not every attempt to make a humorous/engaging title is 'clickbait'.