🚨: So..... it happened!
3I/Atlas did accelerate non-naturally at perihelion to navigate away from the sun. It also unexpectedly increased in brightness.
There are potentially natural, albeit far-fetched, reasons this could happen on its own, but add those low probabilities to the list of already very low probability explanations and either this comet is a combination of all the rarest possibilities, or... it is non-natural, intelligently designed and controlled.
Occam's Razor says it is the latter. The simplest explanation is usually the truest. And when all other explanations are exhausted, the one that is left, no matter how improbable, is likely true.
This satisfies both checks.
Keep your eyes to the sky this November!