I don’t know about that statement. The game itself gives an error message telling you what the problem is. It clearly talks about a node duplicate. You don’t need any documentation for that. It’s possible that before the MSFS update the game has skipped / ignored errors and loaded the model anyway. After the update the game became more strict and starts to ignore models with errors.
I would say with me finding the error message and @SquawkDirty fixing it we are talking about 3 hours for the fix.