Yes. Than a modern passenger car with multi-stage cats, fine computer control over timing and fuel injection, and now particle filters on some gas cars? Versus a small engine with a carbeurator, probably set to run lean (thus high NOX emissions) and no fine control, no cats, no EGR, no anything. So yeah, small engines are far, far, far more polluting than cars. Electric mowers/leaf blowers/etc have been the norm in other countries for years. When I visited some friends in Germany I even commented on this, and they had never in their lives seen a gas powered lawnmower or leafblower/trimmer.
And besides that, like with electric cars, long term ownership will be far cheaper even with a higher entry bar. Unlike a gas OPE engine, electric requires no fuel, no maintenance like spark plugs, air filters, oil changes. Not to mention health benefits to operators (not breathing in the smog emissions, again like higher NOX with these), hearing (how many people *actually* use earplugs while operating?). The main issue will be people with larger properties, but I doubt this will affect tractors.