//The flag is always painted the the imaginary pole at the side that is moving forward.//
Of course it does. If it was a real flag it would trail towards the rear of the aircraft as it taxied or flew.
In any case it's immaterial to some. When I have pointed out errors in flying the Union Flag before on here I've been told that it doesn't matter. I suggested that the same could be said if, say, the Stars and Stripes was flown upside down only to be told "That's different. You can see what way up it's supposed to be." Well anyone who has taken the trouble to find out can see which way up the Union Flag should be flown.
As an aside the A330 is a fine aircraft, even when in normal use for the plebs. This one looks the part for transporting senior royals and politicians around. It's about time the UK smartened up a bit.