I made the Dundalk the last time it came out, (2014) and loved it. It was hit with friends too. My only criticism was a bit of burnt flavor, which could have been more roasted malt than I like, or could have been me burning some extract in the kettle. If they released the kit this year in a 3-gallon BIAB kit I would not have hesitated to order again.
It isn't very true to the Irish Red style though. More like a Wee Heavy. This is not a complaint on my part. If your friend really loves Irish Reds, warn him the Dundalk packs more punch than a typical red.
As for the corn sugar, it does not sweeten the beer at all. If anything, it makes the beer less sweet. The corn sugar is in the recipe to increase the final ABV. Remember, the yeast gets first crack at any ingredient; they just love the corn sugar and eat it all as they produce alcohol.