It helps against the server being able to read the password, so a bad actor (either the website itself or after a hack) could read your password. Which isn’t bad if you’re using good password hygiene with random passwords, but that sadly is not the norm.
For that particular website yes, but a salted client side hash is worthless on a different website.
Edit: plus even unsalted it would only work if the algorithm is the same and less iterations are done