IMO context is: recent US/PRC nuclear talk broke down. US/RU nuclear monitoring also broke down post UKR war. There is no strategic monitoring system anymore between large nuclear powers. Only mind games now. Throw number out there for deterrence/mind game as everyone is either building out (PRC) or modernizing nuke force (US/RU). Maybe anchoring technique to limit proliferation range. That said, there's no reason US adversaries should believe # is credible. And even if it is, each country has different # of launchers/warheads for deterence posture due to different geopolitical/technological constraints. I.e. ballistic missile defense changes penetration ratios.