He's dissembling. He vetoed the bill because VCs decided to rally the flag; if the bill had covered more models he'd have been more likely to veto it, not less.

It's been vaguely mindblowing to watch various tech people & VCs argue that use-based restrictions would be better than this, when use-based restrictions are vastly more intrusive, economically inefficient, and subject to regulatory capture than what was proposed here.