it’s still there, it’s the usual with github and ue4. you need to be logged in with github and make sure your github account has access to the ue4 source (link it in the ue4 user settings). then you’ll be able to see it.
ah, interesting. you won’t get the modifiable ContributionFactor and Brightness values but those were added bonus 
additionally you don’t get the code that allows capturing non-static things into reflection captures, so you will not be able to capture dynamic lights or dynamic objects into the IBL.
might not seem like much but this makes a more strict separation into IBL being a fully static thing and any dynamic lights/objects existing completely outside of the IBL. something that my implementation makes a bit more flexible.
but sure, I understand the great benefit of not relying on a custom build and at least you still get some proper static ambient lighting for big indoor areas. I might even consider it for an own project 