The current law (as adapted following the introduction of VAR and thus not the law when Murray played v Sheff Wed) distinguishes between 'a goal' and 'a goal scoring opportunity'.
A goal scoring opportunity is essentially a chance to shoot. Undav wasn't stopped from shooting, thus 'goal...
He has been in charge 17 times. We've won 3 of them. (12 and 2 in the premier league).
https://www.worldfootball.net/referee_summary/michael-oliver_2/brighton-hove-albion/4/
I think on this point it comes down to semantics. The handball occurred after Undav took the shot, so the opportunity wasn't denied. If he handled the ball and it stopped the ball getting to Undav centre of the goal one yard out, that would be denying the opportunity. So it goes to the bit a...
https://www.thefa.com/football-rules-governance/lawsandrules/laws/football-11-11/law-12---fouls-and-misconduct
SENDING-OFF OFFENCES
A player, substitute or substituted player who commits any of the following offences is sent off:
denying the opposing team a goal or an obvious goal-scoring...