10/10 would report. If the pax was seated in a economy seat and switched to an empty economy row after take off, I'd be OK with this. But with the product differences it'd be a hard no.

Flying EWR-LHR today in supposedly 'Economy Plus' seat, but after boarding I was surprised to see its actually the new Premium Plus product. I can imagine someone doing the same thing if they manage to see an empty Premium Plus seat.