I'm actually g2 but ranks have no meaning in this discussion. That's a fallacious appeal to authority rather than offering logic.
I'm not aware of any ranged JG being considered too strong during preseason so I don't like this change. I've seen the occasional Lulu and Kayle JG tried in competitive but only one of those is ranged all the time and the results were pretty poor overall too (especially for Lulu). TF jungle was played too but again, it's statistically quite poor even in Diamond and it was never tried again by UoL or other teams outside of that one surprise game. There is no statistical evidence I'm aware of suggesting that ranged JGs were in any way OP.