not really. it doesn't automatically mean they "choke" when they lose. sometimes it could be that the other team plays well.
don't you have your own perspective instead of jumping on the immediate bandwagon of this term "choking"?
sure liquid may have lost multiple finals and semis, but the thing is, the teams they face outplay them.
think about it like this, a team is up by 13-2. the game isn't over until one team reaches 16. if the team that is up 13-2 did that on one side (CT or T side), then the opposing team can do the EXACT same thing to the team that is up by a huge lead. it doesn't mean it's a choke, when the opposing team is just outplaying them.