At the very least, they could license and proxy content to a European third party who is willing to take responsibility for GDPR compliance; they could easily find takers.
At any given time, there are hundreds of stories in the Tribune network that have gone viral on Reddit/Facebook and are generating millions of EU page views. They don’t just operate one local newspaper in Florida, and many local stories have broad appeal. As the parent comment mentioned, they very clearly run all of this content on the same CMS and wouldn’t need to integrate each paper’s website individually.