As someone who has shifted to a sugar-free, high-fat lifestyle (keto diet), I can attest to the fact that sugar really is the ultimate evil in terms of health and nutrition. I've lost about 100lbs in 2.5 years... The only thing that I really changed was doing a Keto diet. I've learned a lot about nutrition along the way, and it's amazing how bad nutrition info was when I was growing up.. Common Misconceptions I hear/…
The research on this is mixed, actually. More research is needed. AFAIK, the rest of your points are misconceptions.
There was one Finnish study where the "eat all the salt you want" group had lower mortality than the salt moderation group.
I highly recommend the "Healthcare Triage" YouTube channel as a source of info/infotainment.