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Originally Posted by littlemanpoet
"And stuff".
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I should know better - my bad (just being lazy). The "stuff" is made up of particles that have collided with the comet as it sweeps the galaxy. There are other elements present that were there since the comet was formed (by the Galactic Yeti, who rolls them and tosses them towards the sun).
What is not present is an iron or other heavy metal core.
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I took a look at the website. The images realize three "ice rich" areas on Tempel 1: they look like three little dots on its surface. That is not "made of ice" in any reasonable person's view.
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Those ice patches are of interest as there's not enough there to account for all of the water/ice/vapor that spews from the comet, and so it comes from inside.
And maybe it's not "made of ice." Watermelons are almost 100% water, though you may not think that they are "made of water," especially if you haven't even cut into the surface. Boil one down, and you'd see that most of its mass is from liquid water.
Same goes for comets, though they may not be as refreshing.
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But NASA is part of the scientific establishment, and it wouldn't surprise me if their interpretation is skewed toward what they hope to find. 
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That's funny. Wouldn't you think that some other government's space agency would just love to make NASA look stupid, ... , unless they too are part of the conspiracy...hmm.
What was that about the sun and moon again?