The EMS company had already been on site through much of the event, as it is usual for SCA Chirurgeons to handle first-aid requests and for on-site EMS to be available for more serious emergencies. The reassignment of all duties from the Chirurgeonate to EMS is believed to be unprecedented, however.
This change affects only the Pennsic 35 event and not the SCA Chirurgeonate at large. No reason was given at the time by Pennsic officials as to why the change was made.

I find it disturbing that
EMS/Chirurgeonate issue
As for censorship of the Pennsic Independent, I will point out that there are all kinds of rumors circulating around right now, many of them false, and I would direct you to the publisher of the PI or to the Pennsic publicity officer for a definitive answer to that question. The only request to SCAtoday.net from the Pennsic staff was for correction of a minor typographical error, which we gladly did just as we would if one of our readers had pointed it out to us.
Justin
Disclaimer: I speak only for myself and not for any SCA or Pennsic officials.