You're overlooking that sudden, unexplained or counterintuitive movements in the actual prediction market itself, well before the event occurs/market resolves can themselves convey information, about what apparent insiders think (or whales want to manipulate the market to think).
Obvious example: Polymarket now has 69(!) markets involving Iran: https://polymarket.com/predictions/iran
Consider the timing of those markets wrt 2026 national elections in US, Israel, also Sweden, legislative elections in France, Germany (as canaries for their next general elections) plus a possible change in UK PM, plus any possible Ukraine or Venezuela outcomes. And of course events in the stock market or energy markets make certain outcomes more/less likely.
Also, on Polymarket traders often buy and sell before a market resolves, to exploit patterns in other traders.
And consider what happens at major media e.g. CNN now they've partnered with Kalshi, wrt whether the broadcasting certain predictions/viewpoints/interviewees get boosted/suppressed.
> movements in the actual prediction market itself, well before the event occurs/market resolves can themselves convey information, about what apparent insiders think (or whales want to manipulate the market to think)
Yes, and surely you see that the inability to distinguish between true signal and deliberate countersignal until after the bet has resolved is an indictment of the very model of predictions markets. Like a qubit, you must collapse the waveform to extract the information.