It's odd that they were looking for an actor who resembled the actor who played Robert to play Maurice. Maybe whoever made the description for the casting call put in the wrong actor.Here’s their article on season 2 from back then: https://www.theilluminerdi.com/2021/04/20/picard-characters-time-travel/
Their speculations are somewhat off, but the character sheets themselves that they quote are accurate (except for the names of course but then the names on those sheets are almost never the actual final names of the characters).
And the code name for Picard's mother was 'Marie', same name as Robert's wife.