OP, you have posted the adjudicator decision that the council may continue to enforce the PCN, but I see nothing that says you can submit representations, so where is this in your posted documents ?
The only thing I see is that on the third screen capture, the latest two entries shows 6th Aug 2025 "revert to pre-Charge Certificate", then on 9th September 2025, "Off Hold Compensate". So if this now allows you to submit another representation, then show us a screen capture of their webpage permitting entry of reps.
I would be very surprised if Sheffield allow you to submit any more representations in view of the unequivocal decision of the TPT adjudicator that the council can proceed to enforce the PCN and which tells you to pay the £50. Adjudication is the end of the process, there being no further stage.