Having driven through Sodom, which is situated on the dead end of the dead sea, next to the apocalyptic salt factory they have there, it boggles my mind that you would be able to measure "increased salinity". What I'm saying is the dirt itself is half salt.

"Apocalyptic salt factory" in Sodom creates an image in my mind of a factory whose salt comes from the pillars of salt left behind by all the people leaving Sodom but stopping to look back.

That's what you'd expect after an "increased salinity" event.

The linked study mentions the possibility of Tall el-Hammam being Sodom, but they specifically say thats a whole line of study in itself and they won't go into details in the paper.

Yes, they did avoid derailing the study very nicely.