summary - Argues that the widely-studied “thermal, multiparticle semiclassical black hole” signature is unlikely to be the right picture for any TeV-scale gravitational object the LHC could produce: at collider energies the produced object’s mass is only a few times the fundamental Planck/string scale, exactly where quantum-gravity corrections are large and the semiclassical (classical-GR-plus-Hawking-radiation) treatment is not obviously valid. They argue the more robust expected signature is a lower-multiplicity, non-thermal, “compositeness-like” final state rather than the textbook black-hole fireball. This is a physics-internal caveat about whether the standard theoretical machinery even applies at these masses, not a catastrophe claim - a non-thermal, few-body decay is, if anything, at least as prompt as thermal Hawking evaporation.
relevance_note - The main technical caveat on the production/decay theory: questions whether the semiclassical treatment behind “produces black holes that Hawking-evaporate” is valid at TeV masses, without disputing that whatever forms decays fast.