The CPS actually said the same as United's statement, new evidence was brought to light.
End of the day it's why the court of public opinion is and always will be bollocks. Its either guilty or not, no middle ground, no other side.
I'm.99% sure he's done it, but at the end of the day, it's a bit of audio which could be roleplay. You get caught doing that on audio every man/woman would be fucked if released out of context.