Word for Pretentiously Academic but Useless [closed]
Solution 1:
The two most common, apart from Lux's pretentious, are going to be
pedantic
- in the manner of a pedant, hence
a. excessively concerned with minutiae.
b. needlessly displaying academic learning.
and
pompous
(originally) characterized by pomp and splendor.
(now the primary sense) affectedly solemn and self-important.
You'd use the first if the important aspect was how unimportant the information being shared was, the later if you wanted to emphasize the (undeserved) self-importance with which it was being shared.
Since scholars have been writing for ages and this kind of behavior was, if anything, more common during the era when all scholars were monks, there are absolute scads of synonyms for variants and subvarieties. Some, like precious, could be considered gendered slurs; others, like bookish or nerdy, may not be taken as negative at all in our present culture. Two of my favorites are mumpsimus and sumpsimus.
Solution 2:
sententious
adjective /senˈten.ʃəs/
trying to appear wise, intelligent, and important, in a way that is annoying:
The document was sententious and pompous.
--Cambridge Dictionary
The word signifies the thoughtless serial quotation of distilled wisdom that would only be wise in the correct context, but not when parroted as a received opinion by someone oblivious to the quotations' actual meaning and scope.
In the same way, by extension, the term may be applied to the careless quotation of scientific truths, engineering practices, or legal maxims, when used to support propositions for which those truths are either wholly irrelevant, or perhaps only relevant by way of unintended (and unrecognized) irony.
Sententious also has non-pejorative usages, but those are not so relevant to this question.