I am not super knowledgeable about this side of thing - but it seems like the teams' argument is that the Flyers signed DeAngelo a year ago and not the Canes, so this clause technically shouldn't apply. Letter of the law vs the spirit of it.
We'll see what the league says. I would imagine that if the trade is put on hold, plans would change after the free agent market opens, and this doesn't end up happening.
If you put a direct link to a gif or video as the "link" of your post, I think it embeds automatically. But Lemmy right now does not support uploading videos directly.