Do you have another link to the Washington Post? I'd like to see what they did.
Placards would be easier to set up in the grandstand. On the hill, cards would get out of order with people moving around. TIFO is any form of an organized display. It can also be a large banner, it takes an organized group to create and display it. Or it can be flags, two-stick banners, smoke, flares, or any other kind of visual display.
I also was thinking a Porter tifo should be in order for the last regular season match, but it would take more than just a few people and money.