That statement is right because I feel like Indiana Jones is a franchise that has a weak connection with the majority of gamers. I think most gamers are under 35, and I felt Indiana Jones was one of those franchises that leaned more towards people that are over 35. It also doesn't help the franchise had weak films after its trilogy, and there have been many decent clones
Honestly, I think the major issue with the franchise you can't really do much with it to explore its universe. It's most likely the reason why it's a weaker franchise because you pretty much can't do much to explore the universe, which pretty much killed its popularity among younger audiences.