I do not see the quote of Lewontin's is an admission so much as admonishing scientists from letting belief enter into science and leading to confusion. If what a person believes is used to make or support scientific claims and their are millions of scientists with millions of beliefs, then what value is their in maintaining an objective pursuit of reality? At some point, it would all fall apart. Probably, rather quickly if the intelligent design movement is any example. It is not held together on evidence or preponderance of theory, but by ideology alone. When put up against objective review, it has not held up except in the minds of some very poorly educated and limited people.Just click on Amazing Admission.
Lewontin is a great scientist, but his personal opinion is not itself evidence against the theory of evolution nor does it invalidate scientific education. It may illustrate problems that exist in our system, but they are not problems of teaching lies, but rather how do you teach people without resorting to rote memorization of volumes of facts that are continuing to grow. How can you both, teach critical thinking while demanding that students just learn all of these facts verbatim, because there is not time to review every topic critically. We do have ways around that, but in my education, I had to absorb a lot of material and be able to repeat it back accurately. It was existing knowledge and not lies, but some of it was taught knowing it was contingent on some new fact coming in that could change it all.