[Gene Eric]

Missing commas punctuation or grammar?

YouTube pranksters dupe anti-vaxxer, Piers Corbyn, into...

Contradictory clauses can be grammatically sound?

He was duped, but appears to accept?

Regardless, appreciate the reply.

[alexander_busek]

Missing commas punctuation or grammar?

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.

[alexander_busek]

Contradictory clauses can be grammatically sound? He was duped, but appears to accept?

I already criticized the use of the "appears to accept."

But, strictly speaking, that isn't a grammar error. It is more like a factual mistake.

Regards,