Possible, measuring the orbit will determine that likelihood. The article gives a few other formation possibilities as well. Finding a few other systems like this will help narrow down what exactly happened here. It doesn't seem that impossible to me, not like the title implies, given that while the star is low mass for a star, it's still a large mass, and the planet isn't that huge (50% less mass than Saturn despite being a bit larger in size).

This just sounds like an extension of our understanding of how things are in the universe similar to pre-Voyager thoughts on what they'd find from our own system's planets and moons. What we found was each place was unique with its own fascinating discoveries and not "just another rock". Seems we're finding that out for other solar systems as well.