Confirmed, but has nothing to do with NTLite.
Load/mount boot.wim, Explore Mounted Directory and extract with elevated 7-zip the same update content to the: .\Sources directory.
Save the changes and try then, confirmed working.
Now that this dynamic update integration became a bit more complex, will add support in the tool and update lists.
Dynamic updates support and listing added in build 7797, let me know if works as expected.