Correct, but right now, many DXB-LHR-DXB A380s are recent deliveries with registrations of A6-EVx, some of which may have PE seats (if this is what the OP means by refurbished). But as you say, you can't be sure until you see what the outbound registration is on the day of departure from DXB.

Melbourne is being favoured with many quite new A380s at the moment. Let's see what I'm on in a few days from now!