Also, as a Public Interest channel, Dish cannot tell Angel One (or any other PI channel) what they are or are not allowed to say. Dish cannot control any content of any PI channel. They have a statutory right to their freedom of speech under the relevant FCC rules.
Granted, they cannot run commercial advertisements under the PI rules, but since the Sky Angel service is technically offered by the non-profit "Dominion Foundation" not the for-profit "Dominion Video Services" - this is okay, because they would be technically soliciting for a non-commercial foundation's IPTV service.