Interesting read, and some of the points brough up are valid, but not sure how much those alone will account for being a "safer" car. Lower CG is great, definitely helps reduce roll over, so no dispute there. Engine blocks are solid as a rock, but the structure around the engine is designed to absorb impact, plus the motor mounts can absorb energy before being destroyed. So I don't know exactly how much the lack of one will contribute. The gasoline part is true, but it's fairly rare that gasoline escapes a vehicle in an accident. Decades ago it was more common, but today most tanks are well protected and fuel spills in vehicles are rare.
Again, great stuff, but I wouldn't want to use those points alone to hang my hat on and say EVs are safer than ICE cars. The cars actual crash structure is just as important, probably more so.