The Short Version
The claim is technically accurate but lacks important context. Military high-power microwave weapons do operate across broad frequency ranges (L through K band) that encompass 5G bands like 28 GHz and 39 GHz. However, the most commonly cited weapon — the Active Denial System — operates at 95 GHz, which is NOT a 5G frequency. Crucially, sharing a frequency band does not imply any functional similarity: 5G signals and directed energy weapons differ by orders of magnitude in power, beam focus, and intent.