At least in progressive discourse, this is true. It may mean something different on the conservative side, but I don't see folks over there using that term very much. For progressives, though, the "centrist" position is inevitably the one the movers and shakers in the Democratic Party want, which usually means whatever conservatives want.
I'm not going to bother with expository links for that one. There are about four years' worth of posts under the keyword "progressives" here that make that point, and a lot more under the keyword "Democrats".