He's absolutely correct, although not that the mic was defective.
Trump's mic (the one on the podium, not the lapel mic going to broadcast to maintain as constant a distance to his mouth as possible) was ringing in the 500Hz range over the room PA. You cannot believe how rookie a mistake this is. This is a single knob-turn fix and feedback in this environment is not only absolutely haram, but should not have been heard over the broadcast feed. This is no accident.
Many people are commenting on Trump's sniffles or inhales. Also a blatant act of sabotage. EVERY on-site broadcast audio engineering package includes a Rane Dynamic Controller....a very expensive piece of equipment that adjusts the mic volume as the sound level changes. You can set it to turn up the mic when the subject is talking to get clear, solid vocals then instantly (and in a controlled manner) turn the volume back down as their voice trails off (to the millisecond) to make sure you don't hear breathing, lip smacking, sighing, sipping water, shuffling things about on the podium, etc. Those inhales and sniffles were intentionally not fixed. Notice you did not hear anything from her mic when she wasn't talking. Polished and perfect.
Part of Trump's body language problem was he kept bending down to the podium mic like a contestant bidding on an item on The Price is Right.
This was intentional. Wonder if they can find out who on Clintons team colluded with the networks to attempt to sabotage Trump?
Didn't work, Trump still won, but it just shows you how pathetic they are with their cheating.
Outright collusion is possible, but not necessary. Big Media are all leftists and form the propaganda wing of Big Government and the democRat Party. They can be relied upon to sabotage their enemies (Trump, in this case) without explicit instructions from their bosses (Hildebeeste, in this case).
The 3 or 4 minutes leading up to the start, the raw feed showed Holt and some audio engineers making microphone adjustments because they didn't have it 'right'.
Read into it what you will.