Unless he's left the scene, we can assume that he merely continues to spread his particular brand of poison in his corner of the internet, rarely venturing into the wider community.
But yes, the modding scene is better than it was. Thanks to FTB (as well as Tekkit cleaning up their act), the modpack controversy is mostly a thing of the past. And thanks to King_Lemming, Pahimar, Azanor, SpaceToad, and the rest of the major players in the scene, closed-source mods are very nearly a thing of the past (but not quite).
Those are the major exceptions though. Mekanism, EnderIO, Forestry, really all the other big mods are completely open source now. There's been a big shift in attitudes on that topic.
For contrast, when I first got into modding nearly all the mods were closed-source. IC2, RedPower, Equivalent Exchange, Railcraft, and so on. Very glad to have seen this ethos shift.
But yes, that was my point. Even BC and IC2 (which, while not as prominent as they were, are still giants, with BC still being the bedrock of the modding community) are OS, IIRC (although as demonstrated by the above example, my memory isn't the best).
I mostly see mods from a user's perspective, though, because I can't actually stand Java.
Personally, I haven't heard from FlowerChild in 4+ years. Somebody did start a mod-friendly rewrite of BetterThanWolves though, built on Forge and with compatibility in mind. It's called Better With Mods.
https://github.com/BeetoGuy/BetterWithMods