He did correct it, but it wasn't a misunderstanding because he admits in his second statement that he did indeed say that in his first statement; ''Despite what he said in his previous statements'' (10th May)
As he never mentioned front or back doors that isn't relevant, he just mentioned a 'key' and only one door had a key.
So he changed his account of how he entered the apartment at 9.05 pm.
I disagree as there is no credible reason why Gerry should claim that he walked all the way round to the front door, in the full knowledge that the patio door that was just a few feet away from him was open (and he needed the loo).
That simply makes no sense. But it does make sense that in that first interview when Gerry was hardly at his best and the PJ officer was not familiar with the layout of 5A that a mix-up occurred over which door Gerry meant. We know there was a misunderstanding about the doors because the UK police officer mentioned it to JT and suggested that to avoid a repetition of that error - the patio door should be referred to as the 'poolside' door and the other door as the 'roadside' door.
If the reason Gerry gave for correcting his statement had been of any importance or significance then IMO that reason would have been recorded in his statement.
Unless you can say what Gerry had to gain by deliberately lying about which door he used - them IMO it's obvious it was just a misunderstanding - due to the circumstances at the time.
AIMHO