Its more like that Closure Stylesheets does not recognize @element. Given that its not a CSS spec but just a syntax for the element queries JS library Closure Stylesheet probably won't implement support for it.
For now your best bet is to use a TextResource and inject your EQCSS manually using StyleInjector. To target an element using @element you would need to mark that CSS class as external in case its part of a CssResource so it won't be renamed by GWT.
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