PSA/DNA etc etc means a lot more the "stuff all"...
Yes there are a hell of a lot of fakes around, especially on ebay. But if you do your research, use PSA/DNA etc etc as part of that research, compare as many auto's as you can to the one you are buying and also seek info about the seller then you should be ok.
PSA/DNA do have a great reputation around the hobby and have for many, many years!!! They are not going to just chuck COA's around for auto's as they please, they have a reputation to uphold and a business to keep running!
While the link to that website you posted looks very helpful, I'd use that as another tool within my research! I'd still trust a company like PSA/DNA, rather then just going off of a website like that! At the end of the day diligent research is whats needed to avoid getting burnt!!