Yes, Kevin, the route is open.
To my knowledge it was never actually sealed by the rockfall, but rather there was concern that were there to be another rockfall, it could mean the way through was blocked ... causing people problems if they had pulled through. As a result of this notices were put at the entrances to Swinsto and Simpsons. However, to my knowledge nothing has moved since and everybody is happy doing pull-thrus again.
The initial rock fall was at the bottom of the final short, wet pitch just below Slit Pot.
Does that answer your questions?