It's since being replaced by similar isms like climate change hoax-ism. Very similar way of arguing, dealing with contradicting evidence and seeing a conspiracy whenever a large body of scientists has a consensus.

Unfortunately, the climate change deniers in all their forms have made it much further by having support in politics and having a real impact on people's lives. In contrast to flat earthers.

Just the mere fact that my post here could be interpreted as political (which it really isn't) is evidence of this.