According to the author, they had already killed the book before they even sent him any notes. That seems to be the biggest part of what he found so upsetting.
The book was removed from the schedule, but I imagine it could have been reinstated (reschedule?) if the requested changes had been made. Certainly a dick move by the publisher if it went down like that, but the choice to change the offending section seems to have been there.
"Publisher asks author to change book" hardly seems worthy of attention.