It's clear, that means you still have to stay in a frozen until the scoreboard appears... 
#Ice Block Glitched?
prime nexus
delicate lotus
you're doing it wrong
delicate lotus
to get the achievement, you need to be frozen at the time the last opponent alive is dead
in your video, the opponent is dead after you're unfrozen
delicate lotus
"I have seen that clip"
then you should do what the clip does
you don't want to fit the entire specifics for an achievement into a description
it says as simple as it could
delicate lotus
and does the clip I've sent is any different than what the achievement instruction is?