Just tried the above, unfortunately it didn't work and I was less than 1 foot from the hub.
I'm holding the reset button on the sensor for 5 seconds, the red light flashes quickly and I start ZigBee pairing sequence in HE but it just times out.
CBU is a low-power embedded Wi-Fi module that Tuya has developed. It consists of a highly integrated RF chip BK7231N and a few peripherals, and not only supports the AP and STA dual-network-connection manner but supports the Bluetooth LE network connection manner.
The less than honest sellers on AliEx try to attract buyers with fake low prices, typically are not for the item you searched, and will draw you in with a low price via bait and switch.