The Penguins do need a RHD, and would be smart to swap a LHD for a RHD, but I think Faulk may be shooting too high and isn't the kind of RHD the Penguins would need. The Penguins need a RHD like Savard on Columbus, a right handed DFD to be paired with Johnson on the 2A pair (Oleksiak-Schultz is the 2B pair with Riikola stepping in for anyone injured). Schultz is likely leaving as a free agent after next season (because he's not worth $5.5 million dollars unless Letang is injured), which would leave the Penguins with:
Dumoulin-Letang
Johnson-XXXX
Riikola-Oleksiak
They need that middle pair, defensive RHD long term, and Maatta doesn't fit the team term. So the OP does make some sense, although Faulk isn't the kind of defensemen they need.