Hey, I found it! They just moved it is all 
Go to the game archive and near the upper-right BEFORE you click the game, there is a clock icon to include timestamps in the pgn. I think you can view real-time playback this way if the pgn has the time-stamps included 
(Not 100% sure, since I haven't tested it, but I just noticed the icon now)
I don't think that allows you to replay your game in real time
Dang, you might be right, I tried messing around with it myself, but didn't figure out how to do it too 
As I was missing this feature myself, I built an online tool that lets you replay a game (from pgn file) in real time.
There's not much to see yet, but I will probably add a video player like "scrub" bar. For now you can just play/pause and skip through moves.
Here's the tool: Chess Replay
This is such a basic and useful feature. Why did they remove it?
https://chess-replay.joren.co/ This is an excellent site for downloading your PGN to as well. Works great!
nooo why did they remove it