I'd be curious if they could elaborate on the errors and issues which make them say this. We're following the standard ads guide pretty closely. This makes calls to the APPNEXUS click API, which I'd think would be desired for tracking purposes.
You're welcome to connect me with them and perhaps we can sort out a technical solution to follow the guidelines.
Otherwise we could change the export script to use the <a> tag wrapper pretty easily. The AxelSpringer ad already wraps the main content div in an <a> tag and the IABPoliteAd actually changes the main content div to an <a> tag itself.
I'd need some more details - in your original code you use:
<a href="javascript:void(0)" onClick="window.open(APPNEXUS.getClickTag(), '_blank');">
But your most recent post is:
<a href="javascript:window.open(window.clickTag)">
If it is the clickTag version, can you send more of a full ad so I can follow the way in which this should be extracted? (I can of course infer this, but it is easier to make sure I get it right from an ad that passes muster).