There is no such thing as an NPPL Instructor, you teach using an FI(A) and as such it meets the requirements for the Instructor to log the flight towards the restriction removal.
Go on, ask me how I know......
I certainly believe you if you tell me it counts, but I fail to see the legal basis for that.
When instructing for NPPL, you don't exercise the privileges granted by the EASA aircrew regulation. You exercise privileges granted by the UK. Would a microlight supervised solo count? Why would it count? Why would it not? If you supervise in France a brevet de base student (you may do so according to French regs), would it count? Why would it not count if the NPPL counts?