Sorry if its common lore knowledge, I'm not the best with lore.
The Splicers had SIVA technology on the Moon during the SIVA Crisis. We clearly saw this when they resurrected Taniks. However, going back to the Moon in Shadowkeep, I don't see any trace of SIVA. It's almost like it never existed.
When we destroyed the replication chamber, did it destroy all of SIVA? Or did the Vanguard cleanse it from the Moon so the Hive couldn't use it?
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Notice in the risk/reward mission the tank that had the barrel cut off by siva was reattached