Nope, you're just going to have to live with it.
I'm sure I saw a video of Diana explaining their new range and it said about the parts being made in China and being assembled in Germany, so they can get around the "Made in Germany" bit, I don't think you're going to be finding any more news about it, fake or not as Diana aren't going to want to keep bringing up the subject as they probably are finding it a bit embarrassing and want the whole cock up to just go away.
It's almost like another Ratners carbuncle and I wouldn't be surprised if something happens to Diana over the next couple of years, they've never really had a foot hold in the UK, so their loyal fan base is pretty non existent in this country, so wouldn't really be missed if they went under, as for the U.S. market, what with the introduction of the new U.S. made SIG air rifle, that could be taking a big chunk of European made air rifle sales and could finish off Diana, especially if they bring out an underlever model at a later date.
Pete