That was from me asking if I could mod one of his locos directly.
So you may want to delete that loco.
Provided the loco is for your own use only no permission is required. deadpool is quite in the clear. I have seen it argued though that posting screenshots is a form of 'distribution', but that's a tenuous argument at best. Irrespective of the screenshot's validity though changing a loco that you legitimately own (including freeware!) for your own use only is and always was perfectly legitimate....