Scientism is just a catchy phrase for blind faith.
Most "scientism" I see in the wild is just people who were already indoctrinated into magical thinking treating "science" the same way they previously treated religious dogma.
It's irrelevant to science the same way astrology is irrelevant to astronomy. It's cargo cult "science"-iness.
Science might not be, but there are plenty of Scientismists out there.