Unfortunately, no. There is a lot of confusion surrounding the on/off function of the dimmers and fan controls. For both of those, setting the switch in the on/off mode uses the switch’s dimming or speed control circuitry. So on/off for the fan switch really means on/off for AC fans only, because that is what the switch is rated for.
On the other hand, the under-development On/Off switch is a true relay-based switch which does not have any dimming or speed control circuitry. So that would be the properly-rated switch for a DC fan.
There is some history here. Inovelli originally wanted to design combination switches where the on/off function was a true relay based solution. Unfortunately, that didn’t work out development-wise, but the on/off function was left in, as it does have some uses as long as the switch is controlling a load that it is rated for.