There is a lot of buzz on the internet lately about a US TV series called Deadliest Warrior, a US TV show in which different weapons are put to the test to see which one is the deadliest.
Many people on the internet think that David is narrating the series in his Dilios accent. However, the name listed in the credits is Drew Skye. Some believe it's a pseudonym David is using, but I disagree. I've watched the show a couple of times and have listened carefully to the accent. I do not believe it is him, but a very close imitation.
Meanwhile, someone went into IMDB and put David's name in listings for the show. Why would anyone do that if his name is not on the credits?
I've watched a few episodes and I am convinced it is not David. The narrator is making a good imitation of David as Dilios in 300, but his pronounciations are somewhat different. I suspect he's American, but I have no way to prove it for sure at this time.
Until David says otherwise I do not think it is him, especially since his name is not on the credits.
And what of the Wikipedia article that lists him as well? There's a reference number next to it that points to IMDB. And, like IMDB, Wikipedia gets much of its information from the general public, which has a margin for error.
So for now, I choose not to assume it's David until he himself says otherwise.