Does extended, indefinite solitary confinement of an atypical duration, under some circumstances, violate the Eighth Amendment, as at least five circuits have held, or can solitary confinement never violate the Eighth Amendment?

Does the Due Process Clause require meaningful review hearings where prison officials are open to the possibility of releasing the prisoner from isolation, as some circuits have held; or does a perfunctory hearing with a predetermined result, regardless of the evidence, satisfy Constitutional minima of due process, as the below court held?

If this is sufficient, as the below court held, that a perfunctory review with a predetermined outcome meets the Constitutional minima of due process, the followup question presented is: Are prisoners entitled to equality under the law? Because equality goes both ways, and if the law applies equally to prisoners, then conversely, the law as applied to prisoners also applies equally to unincarcerated citizens who, if subject to the same farcical administrative due process as state prisoners, will more easily become prisoners of the administrative state themselves.

Does extended, indefinite solitary confinement of an atypical duration, under some circumstances, violate the Eighth Amendment?