I'm not on X, so can't share the post, but I saw it shared from Uganda Athletics. Here's what it says:
Breaking News 🚨: Ugandan starts Joshua Cheptegei and Jacob Kiplimo will miss the 2025 Tokyo World Championships, set for 13-21 September due to personal reasons.
We request that their privacy be respected at this particular time.
Final lists for Team Uganda 🇺🇬 coming out soon.