So, this manga somewhat retconned the existence of Hi-Nu Gundam being the planned successor of Nu Gundam instead of the default Nu Gundam in CCA Novel and Beltorchika's Children.
The clue of F90 actually has been dropped since Job and Omur's chapter. When Omur offered Job to work at SNRI, it foreshadows Job being one of the people who worked on F90.