This is false. The 'Arduinos' were effectively combined last September. [1] It's now "Arduino Holding", and the "Arduino Foundation", of which Musto owns or controls 51%.
As for the outing of Musto's academic record, I would simply suggest Torrone is looking out for Arduino, and importantly the idea and reputation of Arduino as the most successful Open Hardware project. Musto has proven himself a liability to the Arduino brand, and he controls a majority of it. As child comments have said, it's not character assassination if it's true.
Personally, I think missing Eagle files for a few Arduino boards doesn't quite qualify for not being open source. That's a due diligence issue that many more open source projects are guilty of, especially in the open source hardware world. The power of Arduino is in the IDE and to a lesser extent, the bootloader, which are obviously Open Source. However, numerous publications [2] have written about the Musto situation, pointing out the grave situation they're in, and nothing has been done about it yet.
[1]http://hackaday.com/2016/10/01/arduino-vs-arduino-arduino-wo...
[2]http://makezine.com/2017/06/09/free-arduino/
Disclosure: I wrote the hackaday post [1]. Torrone has shared documents with me, and I spent a few bucks on Fiverr to translate Italian court docs. The situation is fucked.