They system used is the Xos Digital system. It is shot with HD cameras (2 sidelines and 2 endzone) but the feed shown on the monitor is not in HD. It is a separate feed than what is shown from the broadcast. In my experience with the Xos system, I have not seen a broadcast feed shown in the non-HD monitor when reviewing a play.
IOW, the crew most likely did not see the ESPN camera version of the play and were left to decide using the Xos version of the play on a small monitor in non-HD.
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