Why was there no radio of the VSC message which prompted Hamilton’s apology? | Formula 1

Lewis Hamilton expressed regret to his Ferrari team for not pitting during the second Virtual Safety Car period at the Singapore Grand Prix. This decision significantly impacted his race, causing him to drop from a potential podium finish to sixth place.

After the race, Hamilton revealed in a radio message that the choice not to pit was his own. He was feeling unwell and had to visit the Medical Centre, which prevented him from addressing the media to provide further details about the incident.