Regardless of it being shown on screen or not, they've either reduced the time it usually takes them to work it out by about 400% or they didn't forensically review it
I've seen refs play advantage before for fouls outside the box and then pull things back for the freekick when the advantage didn't play out. Don't see why that can't also happen for penalties
Bit odd given Ralph seemed to indicate at the pre-match press conference that he was all set for an appearance on the bench. Good to err on the side of caution though, assuming its not a relapse of any kind