While the grains thing was particularly stupid advice, recommendations haven’t changed as much as you’d think. The guidelines from reputable sources as far back as the 60s and 70s were fine. They didn’t understand how deadly refined carbs were, but recommended eating fruits, vegetables while limiting desserts and too much fatty meat; now you might be eating a bit too much carbs without understanding the risks, but you should be perfectly fine with that diet.
People have been making noise about this issue for a very long time. Doctors know this stuff is poison and causes cancer. It’s always seemed silly that just the right amount of poison is good somehow. Of course, you don’t know without study, but experienced people can see areas where the data doesn’t seem to make sense.
I remember hearing about this stuff a few years ago and it was nothing new, even then. We know that early studies looked good because many “sick quitters” stop drinking due to their failing health. This makes non-drinkers look less healthy. Now this stuff is still actively studied and many of the pro-alcohol people insist it’s still healthy, but the writing has been on the wall for at least 5-10 years; no amount of alcohol is “healthy”.