At one time, before the early 20th century, astronomers did not understand the distinction between planetary and galactic nebuli. There was speculation, but until the big scopes saw first light these little patches were a mystery. Some astronomers still use the term nebula to refer to a galaxy or an intra-galactic dust cloud.

In light of this I am not sure what "ridiculous statement" is contained in these statements. They both seem to be straight forward true declarative statements. ???