no - google does not get the entire newsgroup - it misses some messages completly - and others messages are "not archived" - merely sent out to the news servers.

this is true of many news servers - i used to subscribe to three - one which got e-mailed to me as it was the most complete - and two which I checked via web, PLUS I would look at dejanews as well - content would be different on all four; though it was the same newsgroup on all four servers.