Just my opinion of course but even if the aliens learned english and had a 4 hour interview with Joe Rogan I would just assume it is AI. The believers would continue to believe and we would be in the same place we were a decade ago. Perhaps it would start to get real if there were constant battles between the aliens and ICE resulting in a few aliens being locked up, agents being turned into goo and the military having to step in.
That link seems to be paywalled too, or more Create wall, says submit your article to view your free article (Interest new one with the Washington post)..