As long as he isn't releasing it or sharing it I don't think that there is an issue. Saying he can't modify for his own use is a little ironic given that it's a mod for game.
Though I swear I released a fixed version since that one anyway. I do have a fixed version laid about somewhere. Certainly worked in update before last
An updated version would be welcome on repository, we'll see how to prevent conflict with the other Dove
@SixSixSevenSeven I look forward to this getting updated. If you are looking to rename it, I have six names you could consider if you wish. Spoiler: The six names (they're all still named after birds) Ibishu Hawk Ibishu Falcon Ibishu Goose Ibishu Quail Ibishu Heron Ibishu Osprey I did some research to get some names of birds found in Japan.
That, Falcon, and Osprey are my favorites of the bunch I came up with. I think I might uses those names the next time I make Ibishus in Automation, since I enjoyed making a 1980 Miramar in Automation.