No, you do not need their hub; they are Zigbee devices (albeit with slightly non-standard behavior--read this thread if you haven't: Xiaomi & Aqara Devices - Pairing & Keeping them connected) and can pair directly to Hubitat. You'll need a custom driver for it, which it sounds like you've already seen. The ones by veeceeoh, Markus, and I think one newer author are all popular ones around here.
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