Does the prohibition sign placed under the built-up area sign indicate that the prohibition applies to the entire built-up area with the exception of the section of the road on which it has been replaced or cancelled?

Why?

The video shows a B-33 sign displaying 40 directly below the D-42 built-up area sign. This makes the 40 km/h limit apply throughout the built-up area, except on sections where another sign changes or cancels it. Passing a junction alone does not end this restriction.

§ 15 ust. 4 rozporządzenia w sprawie znaków i sygnałów drogowych