re: Sounded like a reasonable question to me
OK, you get half marks. You looked and thought but didn't quite understand.
Pioneer has a BEAMED transmission, whereas TV signals are BROADCAST. The Beamed signal covers a tiny fraction of the sky whilst the TV signal covers around half the sky. (technically, TV signals are normally beamed in a horizontal cylinder, or sometimes even a broad directional wedge, but it diffuses a fair bit).
The ratio of sky coverage of the Pioneer beam (less than 1/10 of a degree) compared to a hemisphere is about 1:1 million, so you would already need an Arecibo size receiver to reliably detect TV programs from the Kuiper Belt. To detect them from the nearest star, you need something about the size of our Moon.
Need I go further?