Cold reading performed as a con is infinitely more effective if the cold reader actually has done homework or is able to somehow influence events. Con men do in fact do this-- a good con does a lot of homework before approaching a "mark" and may try to orchestrate events as well using shills. I've heard this called "hot reading" as opposed to cold reading.
If Q actually were a pro-Trump psyop (not out of the question given how Internet-savvy his campaign was) then Q may actually have some inside information, resulting in some very effective cold reading. This could also be the case if Q is someone else's psyop (Russia, China, Saudi Arabia, Israel, organized crime, etc.) and has a line into its employer's intelligence apparatus.
I realize this may also verge on conspiracy theory, but looking around the world at nations as diverse as Russia, China, and Turkey, and now at the USA I feel we are in the final stages of what amounts to a global elite deviant takeover. The world will soon be a mafia state of sorts ruled over by a superclass of amoral gangsters who use state of the art surveillance technology and psychological warfare techniques to manage the population. It will be a "velvet glove, iron fist" system like Singapore where the need to actually "disappear" people is significantly mitigated by the clever deployment of psyops to head off any substantial resistance before it's an issue.
William Gibson was a prophet. It never ceases to amaze me how perfectly he nailed the zeitgeist of the 21st century. This is the criminal age.
I also can't help but factor in the rapid development of the space industry. History does tend to rhyme. During the last "age of discovery" a major motive for people leaving Europe was to escape an extremely corrupt and decadent oligarchy. Maybe people will flee to Mars to escape the modern version of bawdy oligarchs in powdered wigs and merkins.
Who knows... maybe corruption and social meltdown is some kind of built-in developmental phase in our species that works to drive us outward in another burst of colonization. If I were an alien watching I'd be scared to death and debating the wisdom of just hitting Earth with a kinetic weapon before it's too late.