No it doesn't say that the text color is same as background. It says:
"Invisible text found."
And then explains possible methods that could be used:
"CSS 'display' property set to 'none'. CSS 'visibility' property set to 'hidden'.Same text and background color."
All pop up and rollover content is exported with: "CSS 'display' property set to 'none'", and it has nothing to do with the text color.
Also where does this site guarantee that such content will be penalized by SE? This sounds greatly paranoid since most pages on the web has these types of hidden content. You can't make any pop pup without hidding text. So most pages with popups and rollovers have it.
You can also read it in the explanation:
"Analysis explanation: invisible text can be used both for legal reasons (eg. in navigation structures) or..."
Tрe underlined is your case.
So take it easy.
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