Ah - that's interesting. I see there's an LA Times article from 2018 about it "Stalls, stops and breakdowns: Problems plague push for electric buses".

On the other hand they seem to be getting a lot in in London, mostly for short less busy routes far from the center. Here's some youtube shot in one https://www.youtube.com/watch?v=uaHZufvD_C4 They do look a bit cheaply made compared to usual London busses.

On 13 routes with 16 more scheduled https://bus-routes-in-london.fandom.com/wiki/BYD_BD11#Routes...

The problems seem to be mostly the batteries running out. Maybe they've improved?

(update - went and tried one in Canary Wharf https://postimg.cc/XBJ2zXvX https://postimg.cc/D8SjQWDM - was fine really)