I don't know if this could be the "bursting of the bubble" they're talking about. But I think this just just a normal thing with bitcoin. Especially Christmas is coming and a lot of people trying exchange bitcoin to fiat so they could use it.
Things like these are normal with bitcoin, and we, users, should know this. We all know that bitcoin's price is volatile and we won't know when it will rise or fall. We should not panic on things like these because we should be expecting these to happen. Another thing is the upcoming big events internationally, many people for sure are converting their bitcoins into fiat so they can use them.