Does anyone knows if it is possible to use a CC2652 flashed with OpenThread firmware with the new Matter integration?
Looks like in theory it might work Thread => non-HASS Thread border router => Matter => HASS but best wait for 2023.3:
TBH, my experiments with Matter and a test ESP32-C3 continue to be very unreliable, and even got worse after the HASS Matter demo seminar as later releases added more interworking with Google/ Apple/ other Matter pairing steps. It’s still early for Thread support on the Yellow/ SkyConnect SilLabs radio. It’s also very early for Tasmota support for Matter so Zigbee and MQTT aren’t going anywhere for a while.