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Topping NX4 DSD charging voltage

Atanasi

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I checked the manual of Topping NX4 DSD, which specifies the maximum charging voltage:

Warning: If the voltage of the adapter exceeds 5.2 V, it will damage NX4 DSD.

However, the maximum voltage permitted by the USB specification is 5.5 V at the source (USB 3.2 specification, 11.4.5), before the voltage drops of the connectors and the cable. The maximum voltage at the device is not guaranteed to be below that, though it would often be so with a reasonable charging current.
Is Topping NX4 DSD therefore non-compliant and may be broken by a compliant power adapter?
 
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