Interesting take. Since that article was written the commission posted the audio of many of its interviews (but not all, curiously).
I’ve listened to a few and the people doing the interviewing are not at all aggressive in trying to ferret out information. They are distracted by peripheral issues.
The people being interviewed run circles around the people doing the interviews. There are banks of lawyers representing clients present in the room.
The FCIC did find original material. The author of this article just had not gotten to that point yet in the report. They do not know what to make of what they uncovered which was quite damaging.