Tom Britton's research is used to base the policy of the Swedish health organization on, but he doesn't speak for them. In Johan Giesecke's case it's more difficult since he charges them for some of his interviews, so I lean more towards yes.
You don't have to watch the entire video, you can just read the summary below the video.
In Sweden the policy is to mostly let people do what they want (at least when compared to other countries), unless they're in a risk group then they should take some additional measures. You expose people that don't have a big risk of getting seriously ill to a disease, they become immune and the risk group can reduce their additional measures. I would say that's pretty similar to herd immunity even without it being explicitly called that. Right now I think that's an acceptable strategy[0], when this started there maybe were too many unknowns to go down this route?
[0] There are some unstated assumptions here such as how long people would be immune against it, how many people have serious complications afterwards but don't die and so on, so it's definitely debatable.
My understanding is that the objective is to suppress the spread enough so that the healthcare system doesn’t get overwhelmed while at the same time not have harder restrictions than that people can live with them for a long time, many months and most likely a couple of years. The virus ain’t going anywhere, at least until we have a vaccine. Considering it’s a relative to some viruses that causes common colds, it’s not a given there will be any vaccines.
In Sweden the policy is to mostly let people do what they want (at least when compared to other countries), unless they're in a risk group then they should take some additional measures. You expose people that don't have a big risk of getting seriously ill to a disease, they become immune and the risk group can reduce their additional measures. I would say that's pretty similar to herd immunity even without it being explicitly called that. Right now I think that's an acceptable strategy[0], when this started there maybe were too many unknowns to go down this route?
[0] There are some unstated assumptions here such as how long people would be immune against it, how many people have serious complications afterwards but don't die and so on, so it's definitely debatable.