The issue as I understand it is that when the switch is commissioned (ie first connected) it has to advertise itself as a switch or a dimmer etc. Once that is done it can’t be changed. The Inovelli White Dimmer advertises itself as a Dimmer since it has the greatest capability.
In Home Assistant however it is easy enough to use HA’s “Template” capability to change the “appearance and behavior” of a Dimmer to a Switch. A “Template Switch” once created operates as a switch can then be used on Home Assistant or published to Apple Home using the Homekit Bridge.
That is what I do in my Home. The vast amount of Inovelli Dimmers are actually used as On/Off Switches and I use the Template feature to sent them to Apple Home as switches. That way the family just sees what i want them to.
This topic was talking about a blue switch but it works just the same way with a White Dimmer.
Hope that this helps.