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What he means by that and what you mean are two completely different things.
We used the technology available at the time to build rockets to get to the moon. We stopped building those rockets, and the technology used in them became obsolete. The technicians skilled in working with that technology got old and retired, and because that obsolete technology was no longer used, there are no longer technicians skilled in the methods used for the old technology. It's not like we destroyed the engineering design documents and have no idea how any of it was designed or worked. We understand all of that and could build an exact replica of legacy ships if we so desired, but it would be extremely expensive, and not better than what we could do now with current technology, which is what spacex is doing.
It's like asking if we could build an exact replica of an old 1920s phone switchboard. Sure, we could, but none of the parts used in that are manufactured anymore, so to do it exactly like it was done previously would require manufacturing all sorts of little parts that haven't been made in 50 years.
He means the tech was destroyed.
And why don't they have any telemetry data?