I would never add salt to soil even though I have some rain 8-9 months per year. Salinization of soil is terrible for plants, dehydrates them if strong enough, and prevents or inhibits nutrient uptake until it is flushed repeatedly.
I would urge you not to use salt unless you can flush it repeatedly when you're done, into some stream and not a neighbor's yard. Salt never decomposes, it just flushes away and harms other soil.
At least horrible persistent herbicides would mostly stick to your own soil and not poison things downstream. And you could use grams of them instead of pounds. Better yet, a less-persistent, less-mobile herbicide like Roundup. Or fire plus a mattock.
In arid areas, in ancient time, "sowing a field with salt" was a synonym for making it sterile forever.
When Odysseus tried to draft-dodge the Trojan War, he sowed his own fields with salt to try to prove he was crazy.
Road salt kills roadside plants, tending to leave hardy scrubby weeds behind as the last things killed. Almost nothing grows right near the ocean because the salt kills it.
I don't know this from my experience. I haven't read about ways to9 use salt successfully.
Maybe in soil that drains very well, it can be flushed out of your yard and into soil or a water table elsewhere.
Once diluted enough, salt isn't very toxic, but it certainly is a nuisance until it reaches the ocean.
I did say I always have an opinion, but you have to decide how valuable the opinion is.
