Hip Hop Skid Bikes / Hipster Sleds / HHSB

They do look quite narrow but I expect those are PDI longneck XL grips and I doubt the bars are narrower than drops or bulls and people often ride on the tops of those.

They are ~ 35cm so narrower than any bullhorns.

You hear about narrow riser affecting breathing but I never found it to be the case. Not great when you increase the effort, but ok in town.