Nonsense.
Keyword density and keyword prominence are very very
very important.
Millions of pages on the web will mention certain words. What puts you ahead of the game is how often you use it within your content and how prominent it is within all the different sections of your content.
So at least you agree that keyword prominence is important.
Keyword meta tags alone won't help you rank well for a phrase. It's true that the importance of meta tags is decreasing. It is
not true that keyword meta tags are worthless.
1.
SEO isn't just about words, it's about quality.
2. One way SEs measure the quality of your content is to analyze how well your keywords match you content.
3. Therefore, it is important to make sure the phrases in your keywords meta tag match your content.
You can do well without the keywords meta tags, but you are safer by doing whatever you can to prove that your content is worthy of high rankings.
SEO is about
optimizing as many aspects of your content as you possibly can to improve your rankings. The keywords meta tag helps you do that...