The be fair, it was very hot here when they filmed that, so that maybe explain some of the sweating. Luke does look like he has lost some weight facially but when you see him in the vlogs charging off into the distance, he looks as big as he ever was.
I've been to Salem and I'm not sure you can justify not doing the Witch Museum, really. It's definitely the main attraction.
I've put this in the general Disney Vloggers thread but thought it worth repeating here- they seem disproportionately upset by the recent YouTube video showing people scrapping in Magic Kingdom, so much so that they seem to have put out some sort of statement about it and it sounds like they might cancel their September trip over it. It's their money and they can do what they want with it of course, but this sounds very OTT.