The LNBFs discussed in that thread receives circular polarity signals from the Dish Network satellites. They do not receive linear polarity signals from the true FTA satellites.
The confusion in the linked thread is that the posters are referencing the theft of Dish Network programming from the Echostar DBS circular polarity satellites using FTA receivers. They are not discussing the reception of true FTA channels, which are transmitted unencrypted on FSS linear polarity satellites.
Edit: slow to post. Sorry!