Petard hoisting is not even appropriate here, since he did not “fall into his own trap” (another meaning of the term) since he was not setting a trap - But he was certainly caught lying over and over again...
More closely resembles the phrase “Methinks the lady doth protest too much”
Now I'm left watching the word 'moot' gradually take on a meaning exactly opposite to what the word moot means. 'Moot' means subject to debate or open for discussion. Journalists now use it to mean settled and no longer open for discussion.
And while I'm at it, 'short-lived' with a short 'i' is becoming the preferred pronunciation. The long 'i' is the correct pronunciation.
"Short" is an adjective. Adjectives describe nouns, not verbs. Therefore, the "lived" in "short-lived" must be referring to the noun "life" as opposed to the verb "live." If one were to pronounce the i in the short fashion, implying a verb instead of a noun, one ought to say "shortly-lived."
And, yes, I know. The OED changed the preferred pronunciation to the short 'i' around 1993. But other dictionaries are split.
And while we're at it: YOU KIDS GET OFF OF MY LAWN!