Update: I managed to get a friend interested in the tutorial ARG, and this evening we did an investigation into the new update. Specifically, my friend managed to mod in the ability to negate the ragdoll effect of falling by lowering player gravity and managed to use this to enter the blood room safely. I approved this method of investigation for 2 reasons: the first is that the boxes seem to be set up to allow you to fall through safely, but for some reason arent properly arresting momentum; the second is to determine if the radioactive capsule was still in the blood room or if it wasnt.
We managed to confirm that the radioactive capsule is still in the bloodroom, although it was on the ground rather than in the window. He picked up the capsule before thinking to take a screenshot, but heres a recreation of its placement.
Additionally, we managed to get a screenshot of inside the blue pipe.
It is a possibility, judging by the texture used for the far blue pipe, that there is supposed to be an alternate way to enter the blood room. This texture is the same one used for the trapdoor that is unlocked by the 3 radioactive capsules, which is why Im mentioning this. The purposes of this investigation was to confirm the further existence of the capsule in the blood room, so we will not be looking into this lead any further with the use of mods.