Hello corundum, your plant still looks okay to me. It is just closing the center rosette in reaction to the excessive heat, to protect itself as there is much transpiration going on.. My semps do that too at this time of the year, so I try to move them to a part sun area and I have to do daily watering to cool down the plant and its root zone. I do it early in the morning before the hot sun comes around. I water directly the media, not the rosette, otherwise you will risk fungal rotting of the leaves. Looking at your media, it looks very good and well draining so watering daily early in the morning will not be a problem.
It is also dropping its older lower leaves, and will just keep the center core for now, new growth will come at the center. As those older lower leaves turn brown and dry out, you can gently remove them, that way the base stays clean and avoid possible powdery mildew problems. On a worst case scenerio, if it still feel too heat stressed it will trigger bolting, bloom stalk forms and that is a sign mommy plant is on its way out. But don't fret if that happens, it may still try to do new offsets or you can get seeds from the blooms later.
Remember semps are alpine succulents, they prefer cooler conditions, cooler air flow around. I find summer time always a bit of a struggle for my semps. Survival of the fittest. I do the watering early in the morning while outdoor temps are much cooler. It will be pointless to water them when temps are already in the 90F's and higher, the succulents shuts down at that point as it waits for the cool down at night again.
Our temps in my area is similar to yours, very dry here since we have zero rainfall till end of September and daytime highs staying at 98F to triple digits at this time of the year. The only blessing is that we still manage a good cool down to low 60F's at night, a welcome relief to the garden. Semps are best grown outdoors, so I try to manage it by positioning it in part sun/shade area too.
Fall is the time it perks up again, so just got to wait for Fall temps to return.