Reasoning
In product-space (ADD) compactifications the KK graviton splittings are mu_c ~ 1/V_n^(1/n), far below the weak scale (possibly sub-eV); such light, gravitationally coupled states are emitted in stars and produced in the early universe, which is what generates the SN1987A-type and cosmological bounds on large extra dimensions (and the collider missing-energy bounds). In RS1 the non-factorizable metric gives KK excitations spaced at the TeV scale with weak-scale (TeV-suppressed) couplings - there are simply no light modes to over-produce, so those constraint classes are inapplicable, and the low effective quantum-gravity scale survives all 1999-era data. The inference is a structural exemption argument, not a positive detection - it removes constraint routes rather than adding support.
Step 6 — validity verdict
approved / checked. Reconstruction — premises: (i) the ADD-era constraint classes (SN1987A-type stellar emission, early-universe overproduction, collider missing-energy) all operate through light (down to sub-eV), gravitationally coupled KK gravitons that stars, the early universe, or colliders can produce copiously; (ii) RS1’s non-factorizable metric gives KK excitations spaced at ~TeV with TeV-suppressed couplings — no light modes exist. Load-bearing step: a constraint whose derivation requires producible light states cannot bind a spectrum that has none — a structural exemption. Hidden premise surfaced: those constraint classes have no alternative route to bind RS1 — true of the 1999-era emission/production bounds named, and the statement’s scope is correspondingly limited (“no experimental bound pushes the scale far above a TeV”, 1999 data). The body correctly flags the inference as removing constraint routes, not adding positive support, so nothing stronger is claimed than the exemption licenses. Checked (the RS1 abstract states the inapplicability claim; validity here rests on the traced structural logic, not the authors’ say-so).