Human-powered flight in vs. out of ground effect? There is an impressive flight (figure-of-eight) with a human-powered aircraft shown here: 
                
            

Given the long wings of the Aerocycle 3, can it be considered to fly in ground effect for the whole flight?

Nothing wrong with that - the Ecranoplans are fascinating creations - but how much more power will be needed to lift it out of the ground effect, should it be desired?

Also, this thing is just screaming to be fitted with an e-bike powertrain...
Ground effect plays a role when the aircraft is within one wingspan of the ground, so the aerocycle is getting the benefit of lowered induced drag. It looks to be flying about a quarter of a span above the ground, so using the graph that is about two thirds of normal induced drag. Flying out of ground effect would therefore require about 50% more power.