The study itself:

https://elifesciences.org/articles/59177

Excerpts from the abstract:

    Bradykinin is a potent part of the vasopressor system that induces
    hypotension and vasodilation and is degraded by ACE and enhanced by 
    the angiotensin1-9 produced by ACE2.

...

    This very atypical pattern of the RAS is predicted to elevate 
    bradykinin levels in multiple tissues and systems that will likely 
    cause increases in vascular dilation, vascular permeability and 
    hypotension.

https://en.wikipedia.org/wiki/Bradykinin