OK, I have been tracking the hours on KtP’s calendars versus the initial hours released on the WDW website for over a month now, and his park hours (both regular and EMH) have been spot on. Therefore, I think that his calendars are a good substitute for the old TA calendars (may they rest in peace).
One thing I did not check is how quickly his calendars are adjusted when WDW makes a change in operating hours. For that I would rely on the TP calendar, using the Crowd Tracker which will send you an e-mail alert when park hours or Crowd Levels change.