Four of us went there a couple weeks ago and it was spectacular. Now only 1 of us dove - the rest snorkeled. But we saw tons of turtles, which is the prime reason to go. As to whether some parts of the sanctuary are still closed, I don't know. But there were still plenty of dive spots open.

 

Here's an (apparently, to my layman's eye) good article about present conditions around Apo Island.
Cousteau gives 2 thumbs up to Apo Island protected area | BusinessMirror
The article is from September 2016, but I assume that means it is still pretty much current.
About halfway down the article it is stated that the (smallish) Marine Sanctuary is closed to all non-scientific exploration for now (because of the damage done by the typhoons in 2011/2012).
As for actual recent experience, I can only recount that my daughter and her boyfriend went to dive around Apo Island last year and came back very enthusiast, so I must assume there's still enough beauty to be found in accessible areas.