It's not a new idea. The posted article is just about Voyager apparently observing the phenomena more closely. Voyager 1 had already reached the termination shock of the heliosphere in 2004 and Voyager 2 in 2007. The heliosphere containing a heliosheath, past the boundary of the termination shock, composed of compressed superhot solar winds had been hypothesized, due to the compression of the solar winds that begins at the termination shock.