People in this thread that say "it wasn't just one mistake by tsm" aren't realizing that's a moot point. Ever had 1 inhib left and 1 nexus tower (i think?) and had only taken 1 tower the entire game. To get to that point, where your base is almost completely gone, means you've made way more mistakes than your opponent has.
The ace at 30 minutes meant they walked into mid lane, killed 3 towers + an inhib, then 2 more towers + a nexus, all before CLG respawned.
If you think that somehow that makes sense, watch the rest of the games played in this split or whatever it's called. Every team avoids fights and hopes for catches; even when they're impossibly ahead, because they know if 1 person on their team dies and a disengage happens they're going to lose a majority of their base.
It's not about CLG, it's the death timers of this season. You don't have to be the better team to win games, you just have to be the team that doesn't make the biggest mistake post 30 minutes.
edit:
Previous seasons required you to kill 2 members or more in order to deal as much damage to a base as you can deal now with just 1 catch. It's why turtling worked before this season; you could lose 1 person and waveclear and be ok. Now you can't; they'll simply ignore your towers and dive you and laugh that it's a 5v4 and your turret deals 2 dmg a minute.