I do not believe it is "fake" news. At least not on the Nortons.
The amount of MC's mentioned in the article was only 2 off from what I could find in the assy book pages we copied.
As we did not copy 100% of all pages it may wel be incomplete. A single entry on a page could easily have been missed.
I only found 10 entries with sidecars while the article claimed 40. The remaining 30 could have been added by Psalty before delivery.
Will see if my Spanish contact can do/find something.