Улика из прошлого S01E08 - Сталин

The message about the death of Stalin March 5, 1953, caused a real shock across the country. In the official obituary it was reported: "Stalin has died after a long illness". However, on 9 March, the day of the funeral, standing at the tomb of Stalin's son Vasily again and again repeated the phras: "my Father died!" What happened actually?