I thought about that too - colloquialisms.  I've said "that thing is sick", but rarely.  Not part of pre-Boomer, DC-speak.  West coast thing maybe?  But think about this - POTUS is a Baby Boomer.  "Sick", other than being ill, is not part of that generation's vernacular.  Logic says that it's use by POTUS is atypical and consistent with previous "coded" messages, signals, or cues.    My gut says no coincidences.