Earlier quoted context omitted.
For real. I saw a woman go through security at seatac with a frozen 1.5L bottle. They seem very willing to let the system be gamed.
Technically ice is not a liquid, so she was within the letter of the law.
And you're indeed correct. And that must have been chilled for a long time to freeze that quantity. (Edited: thought you said 1.5l of alcohol)