I say “beliefs” rather than “misconceptions” because in fact many of them are true under some circumstances, or still under active scientific debate.
Belief #1, that protein is bad for your kidneys and bones, is true of kidneys in people who are prone to certain kinds of kidney stones https://kidneystones.uchicago.edu/does-too-much-protein-incr... and the debate about bones seems to still be open. Also, excess protein is definitely very bad for you if you have kidney dysfunction, but the danger isn't always specifically to your kidneys in that case. Probably these should have been mentioned in the article, as similar caveats are in items #4 and #6.
Beliefs #2 and #3 are broadly false but an important caveat is that a diet that contains high levels of macronutrients necessarily contains a lot of calories, which are bad for you. There's still a scientific consensus that high-caloric-density foods—things like bread, mayonnaise, butter, and ice cream, as opposed to lean meat and cabbage, increase your risk of obesity and cardiovascular diseases. (Presumably this is because their lower sensation of satiety per calorie results in overeating, but such explanations are still not scientifically solid.)
Belief #6 is correct for people with salt-sensitive hypertension, as the article notes.
And so on. Most of the “myths” are more accurately “oversimplifications” or “overgeneralizations” or just “debatable”, although a few are really without foundation. But telling that truth in the headline wouldn't attract as many readers, so they packed two or three lies into a seven-word headline. They should get some kind of prize for data compression algorithms or something!