Well there sure does seem to be a lot of literature about it and loads of research.
It's not that new either so far as I can tell i.e. they've just been very quiet about it (since 2016)?
Matter of fact you can buy it from MilliporeSigma (formerly Sigma-Aldrich and owned by Merck) (HPLC grade no less):
ISRIB ≥98% (HPLC); CAS Number: 1597403-47-8; Synonyms: Integrated Stress Response inhibitor,trans-N,N′-(Cyclohexane-1,4-diyl)bis(2-(4-chlorophenoxy)acetamide,trans-N,N′-1,4-Cyclohexanediylbis[2-(4-chlorophenoxy)-acetamide; find Sigma-Aldrich-SML0843 MSDS, related peer-reviewed papers, technical...
www.sigmaaldrich.com
Seems to me it's one of those pharmaceuticals that are worth the gamble not? I mean: what's the worst that can happen? You'll either die or you'll live to be 200 years old and with all of your faculties!

(Come to think of it: not sure which would be worse) (and just what we need i.e. a drug to ensure longevity).
Anyway. On a slightly more serious note and just at a cursory glance: there's some heavyweight funding behind it and some very legit looking research having being done and published and peer reviewed.
Anyway. Buy some and try some and let us know how you get on. Risk factor is probably on par with the new COVID vaccines!
Have a Happy New Year 3020!
P.S. I'm not a medical professional (thought it prudent to state that lest I get a tongue lashing from a certain forum member around these parts)!