I obviously don’t know them personally, but what I get from this old school generation that have been a pillar of computer science and, why not, modern human history, is just a tiny little bit more humbleness than “influential” people nowadays.
Using "humble" to describe a list of folks that include John Romero is certainly an interesting choice of adjective.
They may be humble in their older age but the good majority of people on the list were known for anything but their humbleness back when C++ was a much more dominant language.