YouTube pranksters dupe anti-vaxxer, Piers Corbyn, into...
The use of commas here (to signalize apposition) would definitely be FALSE!
If, however, the term "anti-vaxxer" had been proceeded by an "an"...
Regards,
Full disclosure: I am a Technical Editor; my wife (who agrees with me) has a Master's in Linguistics.
But the ‘anti-vaxxer’ and ‘Piers’ refer to the same thing. How is that not an apposition?
I see it now — “anti-vaxxer” in the form of an adjective.
But “an” before any adjective doesn’t necessarily work.