i guess the question is do you care about the title, or do you just want it to download?
theyre also just called episode 1/2/3/4/5 (albeit in swedish - and have no titles in english) so its possible those dont count as actual episode names?
The TVDB doesn’t have translation for those episodes in English, they’re just Episode 1, Episode 2 etc, since Skyhook (and Sonarr) only get English metadata they’re going to be TBA until they get replaced with real titles.
mine were showing as Episode 1-5 before i deleted the series, and the tvdb api link you have appears to be returning Episode 1-5 as well. not sure why yours isnt updating.
as markus said, sonarr only pulls the english text, so if there is no english translation added (which there wasnt previously) then sonarr gets nothing and you end up with TBA.