Earlier quoted context omitted.
I believe Google is moving towards graphical understanding of the text as well and it should be able to render the pages and see what is going on the page... those days will soon be over and technical excellency in SEO will talk.
What if you use custom blank fonts? Or simply detect the User Agent and serve a different CSS file?
https://support.google.com/webmasters/answer/66355?hl=en
I think they also use this to notify you in webmastertools when/if your site is hacked and is doing it to avoid detection by the normal user.