or it wasn't priced in at all and nobody can quantify the “priced in” concept to begin with.

the concept relies on an idea of aggregate information converging to an average best price in advance of the information being available to all. it relies on someone smarter than everyone else recreating all financial inputs to the company and having enough capital, risk profile and time horizons to exercise that opinion. When even that stretch of the imagination can be undermined by someone richer just wanting to get out.