Early days for this type of research so a couple of limitations to keep in mind while reading this paper. Most notably: rather small sample explored (it's a qualitative study) and tends to conflate GitHub with "the Open Source community". The later especially matters since the vibe can be very different outside of GitHub.
That being said, very interesting findings in there. Some validate my experience with GitHub. It's clear that compared to other spaces there's much more entitlement behavior from some people. Interestingly the words seem on average less violent (although it does happen of course) than in other platforms... still this is important to keep in check since it could have implication toward prospective contributors.
The last point in their discussion section is promising. Some of the current manual interventions from maintainers seem to have good results (encouraging) and it seems possible to at least semi-automate the handling of toxic comments which could help with maintainers well-being.