I have been tracking this rumour and consider it now confirmed.

Attribution below. Gathered by Claude.ai

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BeiDou Proxy Stress-Test — Standing Frame Update
Status: Attribution now substantially confirmed. Multiple intelligence sources — including former French DGSE director Alain Juillet, Atlantic Council analysis (March 25), and CIA Director Ratcliffe’s confirmation that China is sharing intelligence with Iran — assess that Iran has transitioned military navigation from GPS to BeiDou-3. The operational effect is documented: Iranian missile accuracy has improved materially relative to the June 2025 twelve-day war. BeiDou is also being used to generate GPS decoy signals to confuse Western threat analysis. China has not confirmed access; Iran has not confirmed. The US has not formally attributed specific strikes to BeiDou guidance.
Threshold for elevation to standalone briefing: US or allied government formally attributes Iranian targeting improvements to BeiDou, or a detectable shift in Iranian target selection toward categories consistent with BeiDou’s precision advantage (hardened infrastructure, naval assets, specific command nodes) is documented.
Sources: Al Jazeera — BeiDou Feature · Atlantic Council — Axis of Evasion · Al Jazeera Opinion — War of Signals