The Short Version
This claim is false. As of March 2026, real-time deepfake systems can already generate convincing manipulations of sports footage at broadcast frame rates (40–50 FPS) on both datacenter and consumer hardware. While limitations remain with extreme camera angles and multi-person occlusions, these are partial constraints — not fundamental barriers. Convincing deepfakes of live sports segments, interviews, and selective broadcast shots are demonstrably achievable today, making the blanket assertion that they "cannot" be done inaccurate.