Stand-up scooters are allowed (they’re also terrible because you can’t see past them, and their tiny wheels mean their riders are constantly swerving to avoid irregularities in the road surface).
Mopeds (what I was referring to) are absolutely not allowed in bike lanes, they must have full license plates and the drivers must be also licensed.
My general opinion on China over the past few years have evolved to “OK they aren’t perfect, but at least they seem to be trying, instead of actively making everything worse.”