Well, that is a statement..! As an MD PhD with over 60 (co-)publications including multiple in top 1% journals I can say for sure that this is untrue. Of course this may be different per topic and country, but there is perfect research being published by non-PhD scientists. In fact, the PI from a top-tier US university I collaborate with for over 10 years doesn't even have a PhD.

You can be a PI without having a PhD?