Hey @Andyf2199 - this game won't be available On Demand, however replays will be shown this evening at 6PM on Optus Sport 1 & 4/9 at 8AM on Optus Sport 1.
Not all games are on-demand as that is in the terms of agreement optus has with the EPL for this season. Small consolation next season all games will be on-demand.
There is a updated weekly blog which tells you which games are available but for some reason it didn't happen this week.
You can see the games available on-demand in the optus app small banner on upcoming matches.