Teslas are much simpler designs to build at scale, while traditional automakers have perfected the ICE design and manufacturing, they see everything through that eye and bring the warts and complexity from the devil they know (as an example, most non-Tesla EVs do not have a floor battery architecture). It is not at all inconceivable for Tesla to leapfrog the traditional automaker in building EVs they design. That does not contradict VW's ability to produce ICE at scale.