There is the belief in science as the best means to get at the truth and then the pejorative of using science as a type of orthodox religion. So for the true believer in the pejorative you can't even use the term.
Personally, I think this is a lost cause. Scientism in the pejorative sense is a new religion and most likely we are at the very early stages. Even when it comes to lifting weights, every youtube video pretends to be "based on science".
I might be too old to see it happen but I fully expect at some point in the future instead of a movie getting 5 stars, the commercial will say this is scientifically proven to be great movie. A restaurant will claim to have the best tacos based on science.
This is clearly the road we are on and I don't see a way back. Actual scientist will have to be more and more certain in their language because that is what scientism in the pejorative sense is to the true believer and the cult of the true believer in pejorative scientism is growing.
"SCIENCE IS REAL"