AP: Client Signal Strength Threshold Documentation Issue

I feel like there is a bug with this feature.

The Help instructions say this:

When the “Disconnect Clients” option is selected, clients whose detected signal is 6dB below the designated threshold will be disconnected from the network.

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Here i’m testing it:

I have it set to 15, which apparently means -80dBm, which means clients below -86 dBm should be disconnected.

However, it looks like clients below -80dBm are disconnected:

Here, I’ve set it to 5, which corresponds to -90dBM which should mean clients below -96 are disconnected:

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But I see that clients below -90 are disconnected:

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Conclusion
This seems to be a documentation bug: The actual disconnection threshold is exactly what is shown in the UI, it is not 6 dBm lower than this.

P.s. this is testing with 8.5.1 rc 2 on a Balance One, in case that matters.