It would be impossible because it is impossible. Surely you understand there is no escaping the incredibly wide net the media casts in 2019?
To digress for a moment; like just about all footballers, when it comes to the media, Boyd is a robot and speaks to them using the same old worn out cliches. You can almost see the players selecting the phrase to use in their heads, like a jukebox selecting the song to play.
They all read from the same script (I’m not saying I blame them either, I probably wouldn’t trust the media as far as I could throw them), save for a minority.
So when Boyd says he is oblivious to it, it’s hard to believe it’s little more than another pre-programmed, selected response. More specifically, it’s the ‘right’ response.
I would certainly consider that Boyd may be unconcerned, unperturbed, unaffected or impervious to it (and good luck to him if he is, shows he has an incredibly strong resolve) - but he would absolutely know a lot of what is being said.
But back to the question - why is it impossible? If for no other reason, the fact he is forced to respond to questions / statements about it during weekly or even daily interviews is a good indication that he would know what is being said.