It can be such an attempt: if, in order to continue discussing X, I have to refute such-and-such megabytes of text from an external link, that places an asymmetric burden on me.

It would be reasonable to say, "You're coming in in the middle of an argument - the points you are trying to address are being discussed [here](URL)", but "BOOK TITLE decisively proves my point" is another variation of the appeal to unquestionable authority.