No, maf. An observant Orthodox wouldn't even look at the webpage if he thought it was the Sabbath.

The front page explains it quite well.

" A eruv status message (with a green, amber or red light) will appear on the top right of this website each Friday around noon. "

The idea is between noon Friday and sundown (which is the start of Sabbath) you would check by the webpage (or other means) to ensure that the eruv is intact. If it is, you can safely traverse the area within the eruv while carrying. If it isn't you cannot.

Discussion of the fine points, well, that'll take a while, and besides, I'm lazy lutheran, not Jewish of any stripe, so I'm the wrong guy.