It looks like later that month they showed off new versions where they just used the illustrations that were initially inside the text.
It also appears that due to the Florida shooting, the focus of the media turned from the plagiarism aspect, to the need to remove the guns from the artwork. That new focus seems to have allowed the discussion to move on and allow everyone to forget the initial controversy.
https://theplaylist.net/solo-star-wars-guns-20180325/
It had nothing to do with the Parkland shooting. You’ll notice these are foreign market posters, markets which do have regulation regarding depicting firearms in advertisements.