Never said it was unsafe, just not recommended. WebMD has links to scientific articles that sorry support that. But you may counter that you don’t trust those sources. I’m not about to play whack a mole. If you want to exclusively drink demineralized water, go ahead, you won’t die for it. But you’ll increase your chances of developing certain diseases. Maybe that’s an acceptable tradeoff for you - I’d certainly think so if you live in Flint.
OK buddy