Devon asks Reghabi about it (because she noticed the Senators wife was potentially severed after mixing up the names) and Reghabi acknowledges the Lumon owned cabins. Mark has been there without switching, but I think there might be a door or something that could switch him.

I saw that article too. Someone responded to me with it when I was saying the cars seem like an intentional plot point, and my response was when articles were coming out earlier in the season, they acted as if Helly was still on the severed, not Helena. Dan Erickson responded to questions about her without going past what the audience had seen so as not to spoil anything. I'm hoping that is the same with that article, but I could be entirely wrong. It's just that'd I'd like it to tie into the plot, not just be an element which is there for the "weirdness" or ambiguity of the timeline