A Tag-Friendly Word or Phrase Expressing Failure to Communicate Meaning Due to Word Choice
Solution 1:
I think your word may actually be "Jargon." While as a noun it can mean:
Applied contemptuously to any mode of speech abounding in unfamiliar terms, or peculiar to a particular set of persons, as the language of scholars or philosophers, the terminology of a science or art, or the cant of a class, sect, trade, or profession.
the word can also be used as a verb!
transitive. To utter in a jargon; to prate about in a jargon.
Solution 2:
Inadvertent Obfuscation feels like a good choice to me, if it's not too belaboured.