That is indeed one of the major problems with our system for educating prospective educators.
Apparently, the author of this article would rather have incompetent science teachers than to try to solve this problem.
Somehow, the school systems need to get people with scientific training to be science teachers. They should, of course, try to get teachers who show some aptitude for teaching. But passing a bunch of education courses does not qualify someone to teach science. If I have to choose between a science teacher who doesn't know science and a science teacher who doesn't know teaching, I will choose the latter. But my preference would be someone who knows science and has a gift for teaching, whether or not the person has taken any courses on education.
Go onto any college campus, and you will see people teaching freshman math, physics, chemistry, etc, who have never taken an "ed" course. Why is it that somebody qualified to teach college freshmen is unqualified to teach HS seniors?
Simply decree that any college instructor who has taught freshman courses for two years with good results is qualified to teach what his degree is in, in high school. You immediately give an alternate career to college instructors who don't make tenure.
Alternately, bus HS students to the local community college for their junior/senior year science classes.