From the article:

The FBI claimed "anyone entering or attempting to enter the tier where Epstein's cell was located from the SHU common area would have been captured by this footage."

The video, cross-referenced with diagrams of the Epstein holding area, does not appear to support that finding. That becomes obvious in the first 10 minutes of the video. Epstein's cell was in the L Block, accessible via a staircase from the Special Housing Unit's common area. When Epstein appears on camera, he is seen walking toward the stairs leading to his cell, but since the staircase is almost entirely out of view from the camera, he is never seen ascending.

The entrance to Epstein's cell, as well as the primary entrance to the SHU, are off camera in the same direction, meaning there's no way to tell from the video if he went to his cell or exited the SHU.

Another tidbit:

At 12:05:48 a.m., an unidentified individual passes through the SHU.

The inspector general's report says only two staff members entered the unit after midnight: one is a corrections officer, identified only as "CO3," and the other is described as the Morning Watch Operations Lieutenant. The presence of a third unidentified individual seen on the video is not addressed by the inspector general's report.

Here's a MAGAt brain tickler.
Jeffrey Epstein was in federal custody when he, one way or the other, died.
Any idea who ran the federal government at that time?
You know, when Donald Trump's "former" friend died while in federal custody?
The envelope, please ...

"what does "ran the federal government" mean?"

Within the context of the subject at hand? Epstein was under Executive Branch control, and the Executive Branch was headed by Donald J. Trump.

"this place declared"
What size is that broad brush, anyway?