In modern academia that would be a terrible record.
But giving him tenure was a smart bet, because he might have produced more.
It's the Sabine Hossenfelder problem. Should physics fund incremental research which is a fairly safe bet in employment terms? Or should the money go on talented and creative researchers who may waste most of it - but one or two may produce something transformative?
Academia is heavily slanted towards the former approach. Because academia is now a business and has the same bureaucratic and corporate values as other bureaucratic corporations.
This is terrible for original research, because smart people need to given a free hand to follow their intuitions and interests.
Being able to afford to explore, play, and potentially fail would transform physics.
Because in reality academia is producing a lot of failure anyway, without the upsides of transformative new insights.