I guess the misunderstanding here is that the line
The loss of side area (...) reduced the linear stability of the bubble topped Jugs. This could lead to a loss of control if rudder deflection was too great at low speeds.
has just been scanned quickly and the limitation "at low speeds" has been mistaken as an indicator that everything was fine at high speed.
It wasn't.
And the reason for the yaw oscillation the "loss of side area", it was caused by turbulent airflow behind the bubble top canopy hitting the vertical stabilizer behind.
An early (read: not equipped with fillet, anything before -40 and not field modified) Jug with bubble top canopy would always yaw-oscillate
plus when you give too much rudder at low speed, you might lose control completely.
Only the latter (loss of control) is a direct result of reduced side area, the former (yaw oscillation) is a result of turbulent airflow behind the bubble top canopy.
And then again, only the latter (yaw oscillation) has been modelled in the jugs pack so far, which means that if asking for historical accuracy, the next required change would be to add the loss of control in low speed / high rudder deflection scenarios.
Best regards - Mike