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you are confused and I am not your "buddy"...
Read more about HTLC
https://bitcoinops.org/en/topics/htlc/
What you refer to "private key" is EXACTLY the way you move sats in a LN contract (HTLC).
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Is my house unlocked because I have the key?
Buddy, you are lost. Why do you hold a private key if not to prevent the money from moving?