Is a "boson star" even a confirmed physical construct? I can see confirmed neutron stars like RXJ1856 that they think might be a strange star, but... Just based on what is a confirmed physical construct in the universe, a black hole seems far likelier. Obviously they address this in a way I'm not knowledgeable enough to argue against.
Regardless, it will be an interesting scenario to watch evolve!
Regardless, it will be an interesting scenario to watch evolve!