The new griefing detection system seems... awkward

I've had two interesting cases recently.

One day, I had a Volibear top that had a very bad game. The guy tried, he wasn't griefing, he was just bad (or not having his best day). Instantly after the game ended, I received a notification that he got a penalty and that I'd get 12LP and 2 autofill protection games as a compensation. I mean, I feel sorry for the guy, but I'll take the LP...

Some days later (today) I had a lvl 44 Renekton with 0 games played this season. He said it was his first game in months. Well, time to have some patience, I thought... At min. 4 he took the worst trade ever seen (vs Aatrox), even wasted flash, got low hp and frozen. I helped him crash the wave and I took 3 caster minions, because if he had tried himself, he would've got killed. He took it as a taxing, ran into Aatrox and started recalling in front of him in order to get himself killed. After that, he never went top again and starting running it down to mid or bot turrets to get himself killed repeatedly. The system didn't trigger, we got no compensation.

So... is the new griefing detection system supposedly working?