Market - index rebalancing

Quote from another forum -
"I found www.marketindex.com.au explained the process well and have a neat summary of frequency as shown below :
ASX 20, ASX 50, ASX 100, ASX 200 - Rebalances occur quarterly (March, June, September and December) on the third Friday of the month.
ASX 300 - Rebalances occur quarterly every six months (March and September) on the third Friday of the month.
All Ordinaries - Rebalances occur annually on the third Friday of March.
The market receives two weeks notice of upcoming changes."

Didn't TNG just drop out of the All-ords? If so this would explain the big sell-off towards the end of the week. No doubt some instos would sell earlier to beat the Friday rush.