Is that real? I'm highly dubious. It seems like a very large number, worldwide. And it depends on how you define it
From the article itself:
BNEF is including both all-electric vehicles and plug-in hybrids in its numbers, though all-electric vehicles will make up the vast majority of the electric segment going forward
I expect that almost all the pure-electric buses are in China. There's a very large number of them. The last I read, they roll out new stock in numbers the equivalent of London's entire bus fleet every 4-6 weeks, and they're pure electric.
Bloomberg have been wrong in the past, and I think they're wrong again. The transition is accelerating: it's going to happen much faster than they expect. We've got plans brewing right now to accelerate the transition in emerging markets. So once again, in a few short years, Bloomberg will have to revise upward their future forecasts of BEV penetration, and bring forward the date of the demise of the infernal combustion engine - they're predicting annual sales of EVs (all vehicles, not just buses) only overtake ICEs in 2038.
They're also very pessimistic on shared-car mobility, taxis, ride-hailing and car-sharing, growing from 5% of vehicle-km now to just 19% by 2040. And even more pessimistic on autonomous vehicles, with nothing significant before about 2035.
All this means that oil demand drops from 23.7 mmbd in 2019 to 18.0 in 2040. If the drop is that little, then the future really is going to be catastrophically stuffed.
https://about.bnef.com/electric-vehicle-outlook/#toc-download