
Using Aqara Home app, switch the W100 protocol to Thread :
Thread Border Router used - Ikea DIRIGERA hub 
(for some reason, the commissioning via Aqara M3 hub and via Apple Home (HomePod Mini) failed after I paired it once, but then deleted the device, tested Zigbee, switched back to Matter, and tried to pair again?)

Then use the new Matter QR pairing code generated from the ecosystem where W100 was commissioned first (Ikea DIRIGERA in my case) to pair it as a Matter device in Hubitat.
These are the Matter endpoints as obtained from the HE inbuilt 'Device' driver :
dev:76872025-07-25 20:32:46.314infofingerprint endpointId:"06", inClusters:"001D,002F", outClusters:"", model:"Aqara Climate Sensor W100", manufacturer:"Aqara", controllerType:"MAT"
dev:76872025-07-25 20:32:46.313infofingerprint endpointId:"05", inClusters:"0003,001D,003B", outClusters:"", model:"Aqara Climate Sensor W100", manufacturer:"Aqara", controllerType:"MAT"
dev:76872025-07-25 20:32:46.312infofingerprint endpointId:"04", inClusters:"0003,001D,003B", outClusters:"", model:"Aqara Climate Sensor W100", manufacturer:"Aqara", controllerType:"MAT"
dev:76872025-07-25 20:32:46.311infofingerprint endpointId:"03", inClusters:"0003,001D,003B", outClusters:"", model:"Aqara Climate Sensor W100", manufacturer:"Aqara", controllerType:"MAT"
dev:76872025-07-25 20:32:46.310infofingerprint endpointId:"02", inClusters:"0003,001D,0405", outClusters:"", model:"Aqara Climate Sensor W100", manufacturer:"Aqara", controllerType:"MAT"
dev:76872025-07-25 20:32:46.308infofingerprint endpointId:"01", inClusters:"0003,001D,0402", outClusters:"", model:"Aqara Climate Sensor W100", manufacturer:"Aqara", controllerType:"MAT"
dev:76872025-07-25 20:32:33.941debuggetting device info in 10 seconds...
Set the device type to this driver, Save and Close :

Run the Discove_All command,
six child devices should be found and created :
The Temperature, Humidity, and the Battery status are working OK :
The three buttons are NOT working at this time, but the debug logs indicate that they are sending events when single-clicked, so theoretically the buttons could be used via Matter as well. Aqara W100 buttons support will require an update of this driver.
Of course, the Aqara W100 Zigbee mode provides much better control and advanced functionalities, so for now I have no plans to further enhance this driver for W100 better support. I was just curious whether it will work using this driver or not...
A better approach would be Hubitat to create a dedicated inbuilt driver for this device. However, since it operates using Matter over Thread, an additional hub that functions as a TBR will be necessary.