Cox blocking legitimate site

RE: http://downdown.uphero.com/

The above site is legitimate (as reported by Norton Safe Web - https://safeweb.norton.com/report/show?url=downdown.uphero.com). Yet when trying to access it, Cox blocks it and I get this error message from Cox,

Understand I am trying to access this site through my browser's address bar. This has NOTHING at all to do with any email and I did not follow any link in any email to get there.

I live in Omaha, Nebraska. Both a neighbor with Cox and a friend in Cleveland, Ohio with Cox got the same error. So it is not my computer, not my router, not my firewall, and not my modem as Cox tech support keeps trying to suggest. Because I do not want to deal with tech support wanting me to reset my modem, flush my DNS, or clear my cookies when the problem is clearly on your end, I am hoping writing here will help resolve this problem.

Note I was able to access that site a few days ago just fine. And there are no problems accessing any other site. So it seems Cox has that site blacklisted erroneously.