My first time hearing that word too, but apparently: https://en.wikipedia.org/wiki/Truckle
late Middle English (denoting a wheel or pulley): from Anglo-Norman French trocle, from Latin trochlea ‘sheaf of a pulley’. The current sense dates from the early 19th century and was originally dialect.
It sounds like you’re thinking of LoRa, another 900MHz radio protocol.
LoRa has similar bandwidth to Zigbee (125kbps), and as you say is designed for low-power devices running on battery. I have PIR motion sensors at home which have used only around a third of their battery after 2 years.
Security cameras seems to be a large target market for HaLow though, where you need a couple of megabits at a few hundred metres.
Indeed, you will note that they carefully chose the moniker “Daily Active Uniques” and not “Daily Active Users”.
I think that speaks volumes, as humans are definitely harder to retain.