This seems to be "reporting" from an unconfirmed rumor that was originally posted here and has been bouncing around the chinese net for the last 24 hours (I saw it a few hours ago)

Original source: http://www.marbridgeconsulting.com/marbridgedaily/2014-05-15...

We've changed the url to that from http://www.pingwest.com/will-andrew-ng-join-baidu-idl/. We're also going to bury this story until it's confirmed. Pure rumor doesn't make for a good HN post.

Andrew himself confirmed this: http://blog.coursera.org/post/85921942887/a-personal-message...

this rumor has been confirmed by a mail inside baidu, which is spreading on Weibo.com