Just because he played it on acoustic in the video doesn't mean the song is like that. It looked like he was outlining the chords and making sure the lyrics worked with the vocal melody.
He was. There's video of him doing a similar thing with Forsaken on the SC documentary. But... we know the lyrics were for Smoothen, and we know there are acoustic guitars in Smoothen cos it says so on the chart, so it seems plausible that the bit he was playing could've ended up in the song.
More to the point, though, I wasn't saying it
was a ballad - just that Lucien's conclusion of "The Looking Glass can't be a ballad because it apparently sounds like Rush" is flawed, given that our (admittedly tiny) window into the song suggests a softer song way more than it does a harder one. If we are going to scrutinise meaningless bits of information, we might as well scrutinise them properly.