I see , we are talking about the DIFFERENT things.

You talk about EXTENDED MASTER PRIVATE KEY, for the whole wallet.

I talk about a private key for a one single address, containing a fixed certain amount of coins.

If you disagree, I kindly ask you,
tell me please, which other ETH address is controlled by this private key:
0x610c8b06eac7fbd9aeb88b500fd6892b038cc60fc40e9381184130e6893fb600

At least ONE MORE !

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