This won't work. It is just a span tag and AFAIK search engines should not know that this text cannot be seen, so it is indexed.
And...
this does not work either.
I was hoping it would trigger the algorithm that prevents things like white text on white background from being indexed (used to be a SEO thing many, many years ago). 
Didn’t work, unfortunately, it’s been indexed.
I guess splitting up the domain with spaces gets the job done as well.
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