Even if the grens were supported, they would have died anyway. 2 paks wouldn't have stopped that from happening.
What difference do you think it would make to have support there? The KV would've taken some damage and that's all. The grens would still have died. It's far too harsh.
Neither army should have super-rapid-squad-wiping units. It's not reasonable. And even top-100 players lose plenty of squads in this manner.
1 second is not a reasonable amount of time to expect players to react when the punishment for a "slow" 2-second reaction is losing a whole squad.
You may be right, 2 paks wouldn't have maybe prevented that situation (rescuing those grens).
BUT there would have been chance that they would have killed that KV8 (if Soviet player was careless). There was another gren there on the left, it could have fausted (succesfully) that chasing KV8, then it would have been bye bye KV8. Even without any fausts, KV8 doesn't just have that super armor anymore. It goes down quite fast.
That trade I would have done any day of the week.