Justin Irvine maybe??

If you listen close, the guy wearing the meta glasses calls someone a "fucking idiot" at the 2:13 mark of his video
put 2 & 2 together and you have the answer
Thanks, good catch!

AMac was wearing the glasses and doing the commentary and was chirping to the horse when it happened.
I believe it was Justine Irvine on the 6 and it was him, closest, and his colors. Despite they had him listed on the 5 too.