Yes, but the Bolton to Wigan electrification will be going to Wigan NW not Wigan Wallgate. As such only No. 1 platform at Wigan NW is accessible from Hindley and long enough for 6 car. As No 1 is currently used far more than previously when there is (seemingly constant) disruption on the WCML and/or Liverpool L St direction there will be little scope for anything extra to be put there, even if reversing down to SP (No. 3 can be used but it is only long enough for a 4 car train- even after recent track alterations that took No. 2 out of use).
Having said all that, slippage from May 2024 to July 2025 seems an amazingly long delay for what is 6.5 miles of double track, when each end is already wired.