I lived and worked there for 15+ years, was a daily cyclist (Non-motorized). eBikers do ride onto the sidewalk at the very start or end of their trips. But they're already not allowed to do that - NYC has long had a blanket ban on riding any vehicle on sidewalks. The city should consider actually enforcing their existing rules before making new (IMO very stupid) ones. This is just reactionary pandering.

My lowly non-NYCer opinion is that that sounds like a reason to crack down on sidewalk riding, rather than the speed.