That's a Cambridge-Springs Defense. Back in the old days, it was considered part of the QGD complex as was the Slav. Now, it's usually lumped in with the Slavs. Obviously, it can be reached by either 2...e6 or 2...c6.>>
It's incorrect to consider it a Slav, since then, Capablanca's Defence would be a Slav, as would any QGD defence where black eventually plays c6, which is completely silly. But it's never worth getting into an argument with Pfren because, of course, he's always right and DeirdreSky seems similar.
It's sad when GMs and professional theoreticians are so consistently incorrect.
GM Lars Schandorff, in his book on the Queen's Gambit, erroneously placed the Cambridge Springs in the Semi Slav constellation, along with the Moscow and the Botvinnik.
These GMs really should just give up and defer to the denizens of chess.com's forums.
Yes, you can play "Catalan style" against the Slav. You can either forget about the c4 pawn, and play gambit style (this has been analysed a lot recently, and Black is OK), or protect the c4 pawn first with Qc2 or Nbd2- but both moves have shortcomings.
I like playing Semi-Slav style against the Catalan, BUT: I have to start with 2...e6 first, and interpose the check from b4 before ...Bd6, for reasons I have already explained. This line actually has a name: The Ukrainian variation.