I'll have to check out that website..you never know.
In regards to the purpose of the hood liner, I spoke with one of the Ford techs at the dealership when I was there and he said that not only does it provide a sound & fire barrier (mandatory on vehicles from the factory), but more importantly, because the 4.6 tends to run a little warm during the summer months, it will prevent the paint on the hood from discoloring and possibly warping the hood. I know many people remove their liner and report no adverse effects, but IMO it's not worth the risk (especially living in the South.)