A pilot who is out of 90 day currency can either carry out the revalidation by experience which is the 3 take off/landings as sole manipulator or they may seek instruction and such a flight will also count.
No Instructor is going to fly a single 'demo' circuit and let that count for revalidation and why would they, I know I don't? The pilot has sought training and why would a qualified pilot need an Instructor to manipulate the controls for them?
I describe the reference as a misnomer in that it is a revalidation by experience not a revalidation by a PU/T flight.