And I dunno... can you really pull almost 70% of the water out of a beer by freezing??
I've done a freeze concentration once on a 11% and change braggot...turned three 22 oz bombers into a single one, so I know at least a 66% concentration is possible...I estimated my final at ~34%.
To answer one of the OP's other questions, yes, the final product will be a little thicker in mouthfeel, but I didn't find the one I did syrupy. It was actually quite good, if not a bit sweet...it was kind of like a cordial (and of course, had to be drank like one due to the ABV!)