Did you know that one specific person heard the news of Piht's survival from Estonian radio but, as far as I know, never spoke about any Svensson interviews?
The person that I'm speaking of is Sirje Piht, Avo Piht's wife.
According to an article on Estonia conspiracy theories written by YLE, Sirje Piht heard from radio that morning that his husband had survived and that later that day Erich Moik phoned her and told that he had seen Avo Piht on a German TV news report.
If there really was a radio interview of Svensson mentioning Piht, I would expect Sirje Piht to remember that. At least the YLE story doesn't mention that.
The YLE article is at
https://yle.fi/uutiset/3-11808310
The relevant parts of the text are:
"Captain Avo Piht's wife Sirje Piht hears from radio morning news that his husband has possibly survived. During afternoon she gets a call from harbour town Rostock in Germany that changes Sirje's life.
A family friend of Pihts, captain Erich Moik calls to Sirje happy news: 'Congratulations, your husband is alive! We are here here receiving a new ship with the crew. We were looking at German news broadcast and saw how your husband walked from an ambulance to a hospital with a blanket on his shoulders.' "
Later in the YLE article Jüri Lember confirms that the phone call happened and said that three men recognized Piht from the newsreel.
The simplest explanation is that the three men who thought they recognized Piht were wrong. They saw someone else who looked like Piht. That's also the reason why no one has been able to find the footage again.
One thing that is certain is that no German news station had time to send their own camera crew to Finland in time to get a news report out the afternoon same day. The German news station has shown footage captured by someone else and presumably other news stations over the world showed the same film.
I went to youtube to see if there's something there. There was the 20:30 main news report by YLE. It's
https://www.youtube.com/watch?v=F4Y6MvW9nnU .
Starting at about 1:15 on that video there's a scene where two men who have blankets over their shoulders walk from ambulance to a hospital. I believe this is the footage that the Estonian sailors saw in Rostock and they mistook the first man as Avo Piht.