The article you are referring to is by Richard Schulze, who never has come to this forum as far as I know. He might have an email address you could ask him for some proof.
If you want to read what MH has to say about synthetic vitamins you can click the banner above this page and read the page on the website called 'Gimmicks'
Basically what MH says is that inorganic minerals, including most vitamins work on the same principal as conventional medicine. They sterilize the immune system, thus relieving some symptoms but making the underlying disease worse.
Scientific studies agree with those who pay for them.. Science can be made to prove anything as long as you have money to pay for the research. Ultimately the only proof is your own health. Many on this forum have improved their health by realizing that real health comes from eating correctly and not from taking pills or using 'gimmicks'.