However, just reading the frontpage of that website it's clear for anyone to see that it's not an actual newspage with actual journalism. The story you linked may be presented as journalism but it isn't, it's just attempts to make "news" from a person who wants to defend Trump and defame any opposition at all cost. I wouldn't cite "articles" from that page as trustworthy. That however doesn't mean the dossier is correct, or incorrect for that matter. But if you look at established news-sources with actual journalists there is currently no information that suggests the dossier is "all fake and made up by people on 4chan". Perhaps that still is the case and thegatewaypundit really has a scoop, or perhaps not. We'll see.
Either way I found the hotel bed thing to be really amusing!
*popcorns*