I don't think Riot actually knows how to stop drophacks through programmings & stuff. Drophack is typically a hack. It will definitely hack through your so-called "hack-proof solution".
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I need to poop, I inplug my router because i know the game will pause and go take a poop.
My GF just showed up. I need to leave, so I'll unplug my router and make out for a couple hours, then rejoin...
We're losing, I'll unplug my router for 10 minutes, then rejoin and if the other players are still there I'll push to win while they are afk.
And as this guy mentioned in your original thread, your solution is easily abused. You typically just created a game that has the function to pause games. And pausing games will lead to unsatisfied teamfights experience for the other 9 players.
For example, where you probably the first one to die in the teamfight, decided to rage, & goes AFK like a lil b'tch, causing the game to pause automatically. And your teammates doesn't even know if it's either a drophack, or they're gonna blindly blame Riot's server.