Do these numbers add up?

JCX-20-05 breaks down the costs of permanent estate tax repeal, according to the nonpartisan Joint Committee on Taxation. That permanent estate tax repeal could cost $290 billion over 10 years is not too surprising. However, according to the Committee there will be over $8 billion in revenue losses from 2006 to 2010, when H.R. 8 makes no changes to existing tax laws? Could the Committee be using dynamic scoring? Are they predicting a drop in taxable gifts once wealthy people realize that there really won't be a federal estate tax?