Psy op implies an amount of planning and the involvement of the military or the intelligence community. I think it is better attributed to chance that the cryptic pretentious musings of one person snowballed into a cultish internet movement. Because it garnered strength online, the musing person at the heart of it probably changed due to tiny power struggles.

People like to know there is a plan for everything. People always suspect a secret cabal behind everything. People are also dumb and impressionable. It doesn't take a general or CIA buffin to try to target the Venn diagram of those three groups. I think it had the results you describe, it contributed to what we see in the US today: a weakening of the rule of law and a slide into fascism.

Calling QAnon psy op is giving what basically started as a 4chan meme too much credit. If no one took a gun to find a nonexistent basement in a DC pizza restaurant, society at large may have never discovered this snowballed cult, and jumped on it like a cat does catnip, enlarging its reach. The secret "cabal" behind it is maybe a handful of people. Bored and slightly Machiavellian internet users with odd political views and/or the love of endorphin-inducing likes and reach. Never attribute to conspiracy what you can more likely attribute to stupidity. QAnon is stupid. Stupidity with disastrous cobsequences. But not a planned psy op campaign.