Obviously the salinity is an issue and needs to be corrected, but I don’t think that just because you identified one problem that it is safe to assume that everything else is fine. It’s pretty common to have ammonia spikes after adding rocks and that may or may not have happened in this case, but we don’t know because you haven’t tested for it.
It’s not like testing for ammonia is expensive or time consuming. You very well may find out that you you have 0 ammonia, but given that it’s so easy it’s worth doing the test just to rule it out. At least in my opinion.