Even if the Soviets had given up on the space race, they still had a vested interest in embarrassing America. They had every motivation to prove that America faked it, but they didn't do it, because they had all the evidence that it was real. They could track the space craft and listen in on the same signals everyone else did.
All documentation against the moon landing has been thoroughly debunked many times. But you don't care about that.
You don't have to trust the Americans, there is plenty of independent third party evidence from multiple sources
https://en.m.wikipedia.org/wiki/Third-party_evidence_for_Apollo_Moon_landings
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