According to the other site, the PBS they dropped was the National PBS feed, of which there is NO M/C requirement.
I happened to come across this...there IS a full-powered local VI PBS, along with a translator that serves the VI. So maybe the reason why the National PBS was dropped by E*, was due to that they should have been carrying the actual, local VI PBS station in the first place...perhaps E* had issues with getting their signal to their Local Receive Facility, & they'll add it in the near future:
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