My first sentence is just my general complaint about space journalism that the word "size" is not clear because it could mean several things that are very different.

The paper itself admits that this could be the extreme end of our current models given known uncertainties and variabilities and therefore not "forbidden", but yeah, if they find a bunch of them, then we'll have to start tweaking models more.

In other words, good paper, bad headline and slightly hyperbolic article, as is typical for science journalism.