I agree to a certain point.

In trading uncertainty equals risk, and risk in general is what investors try to minimize.

The higher the volatility, the higher the uncertainty or risk.

Longer periods of stability (lower volatility), reduce the amount of uncertainty, therefore that longer periods of stability, will more often result in a price gain than a price drop.

Especially longer periods of stability after a bubble crash, since these define a new floor.

As article the also stated, most of the investors who are more likely to sell, will already have done so.

These consolidations help establish a foundation and confidence around a given price and burn off resistance sellers.