To my eyes, there is no possible way to determine whether it is HITH or not, because the photos are not clear enough. Probably phone cam, which will not show the kind of detail needed to make an educated diagnosis.
It has been stated, the tank previously had ick (yes?)
Secondary infections are common after ick, HITH or other, because the holes where the ick protozoa burrowed into the fish are prime candidates for opportunistic bacteria, and if temps were elevated to combat ick, those higher temps are a perfect environment for bacteria to grow.
And any kind of stress, be it poor water quality, elevated temps, aggression ( the combination of tank mates is quite volatile), previous disease, etc can leave the door open for bacteria to gain a foothold.
If you keep up the frequent water changes you may be able to ward off another epidemic.
If it were me I'd keep the salinity up.
But I'd also think about separating some of those cichlids into different tanks.