See...they need to bring Dennis back to clear that up. But seriously...the press conference appears to be inside (to me at least) so he would not be out in daylight. I am not making a statement one way or the other...just looking at what is presented in the comic.
The reason 'too busy saving the world every other week' is reasonable in universe...but just seems like (to me) a cop out in the real world looking in. As far as Dennis...whatever his status (vampire, powerless, etc...) I would like to see him get put on a strength level putting him up in the 85-90 ton range.