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PBS does support C-Band at their site:
PBS | TV Schedules
But no mention of AMC-21.
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Interesting. The web page referenced above used to just have PBS-X info on it, then it seemed like I couldn't get that web page to work for several years. I haven't seen any mention of TVRO-ers on PBS for a long time. Maybe I was just typing the URL wrong or something, but it looks like the same url I used to use.
Anyway, I find it interesting that for C-band, it mentions the AMC4 PBS X channel, but it also mentions "T-16" . I assume that this is G26??? I don't see any PBS station listed in Lyngsat on that sat. I seldom go to that sat, so I'm curious what they're referring to??? I don't remember seeing PBS there.
I'm also curious whether the DirecTV version of PBS-X is now the same as the C-band PBS-X? It used to be that the DirecTV version was 1 day delayed, ie a Sunday show would be on Monday, etc, etc. I Can't receive the DirecTV version, so I don't know if that's still the case, but the above web page has just one listing for both C-band and DirecTV, so I guess they are the same now.