It's not Terry Matalas. It's not even really "Picard" related. But here is a possible example of the question at hand; are behind the scene statements from those who worked on the show considered canon?
Doug Drexler made a Facebook post about the upcoming SOTL calendar and cutaway of his NX Refit and someone asked him about the NX designation.
Here was his response....
Now we've been calling in an NX Class for over 20 years. It was outright called an NX Class multiple times on the show.
So, who is in the wrong?
I do very much like Doug Drexler, and I absolutely love the NX-01. The refit, somewhat less....
But, in my humble opinion, he's wrong. Or atleast as wrong as you can be with an opinion. On screen is king, and on screen it was an NX Class Starship.