Its pseudo-science bullshit. Basically just "We're going to drug you into a haze such that you can't coherently tell time and then tell everyone you've been trapped in a Mind Prison for A 1000 Years spooky noises!" to convince gullible media consumers that Next Generation Prisons will be even crueler than modern day ones.

The reality will be some grifter bringing in $10B in federal grants to build a Prison Of The Future that never gets past elaborate blueprints. This, alongside a Tesla-style Hyperloop Prison Solution that's just a bunch of cheap real estate with a barbed wire fence around it.

Well, I assume you would just perceive time going so slow that you wouldn't be able to move, wouldn't see the people around you move, and your mind would perceive that amount of time as 1000 years, slowly running out of things to think about, pontificate or notice, growing wretched from the isolation, the lack of control. Basically, its hell in a chemical.

I think that would require your brain to actually run at 1000x its normal speed if that makes sense.

Your brain can't process information that quickly. I can't imagine this hypothetical torture drug gives you supernatural mind powers.