I don't even think Tameem and Dante look like eachother. Not even from the first trailer. The only more obvious thing was the hair and it has already been said several times over that an explanation for it could be that Tameem liked Dante's hairstyle and then had one like it. I find that ALOT more plausible than Tameem forcing the design team to make Dante look like him. He's not some evil dictator, he's a game developer.
However, as ToCool said, unless we were there, we will never know if Tameem speaks the truth or not. Personally, my sense of logic tells me that it is highly unlikely that he would go do such a thing and I find it even less plausible that he would actually be able to pull it through.
That said, I don't even think this is an important issue at all. IF Tameem actually had the design team make Dante look like himself... well, so what? That just says Tameem is a narcissist who wants to put himself into the game. However, if that is the case, then why didn't he do so in one of Ninja Theory's own games before? Either way, it's not important.
All in all, I just wish Tameem and Ninja Theory had just ignored this whole issue and focus only on the things that are important, such as the game itself. Like, storyplot footage, some new gameplay elements we haven't seen before, more character appearances... Whatever, just as long it is important to the game itself!
That people think Dante and Tameem look alike is not important. It's just food for haters. Nothing more, nothing less.