Would google still look at this content even though the user cant read it?
lol i know they are a big company, i have seen it done on other sites but not done very well, would they bother to look if the content was the same as everything else on the site, just a few added extras, or for example the content described the images in detail better than an alt could
You will suffer a penalty and possible ban from google and others for using hidden text. It should never be used a long with small unreadable text those are black hat seo tactics and they might work for a little while then bam you are penalized. IMHO it is not even wroth trying because if you get banned good luck getting back in.
i no a site thats using it and is number 3 on google for a important keyword.
let me give you an examle; spamy techniques are the deseases. when desease of cancer starts the patient does not feel it in it's earlier stage and when you see that person you won't be able to mark him or her as a cancer patient. but after few days it shows every symptoms within that person, which leads him or her to death.
what i want to say is: that particular site is doing a spammy practice. to day that site has incurred a page rank of three but tomorrow it may loose every thing.