It depends on how you define “hit”. Billboard #1? Billboard Top 40?
A few of the bands featured here actually had multiple hits if you define it as US Billboard top 40. And even more of these bands had varying success after their hit songs in the US, but back in their home countries/rrgions or in independent channels.
A-ha was definitely NOT a one hit wonder. They had a number one album and they had a second number one US Billboard hit song with The Sun Always Shines on TV. They also had significant success across multiple albums on the European charts and back in their home country of Norway.
Soft Cell did have only one US chart appearance, but they were in the UK’s top 40 many times and across multiple albums.
Success on the US charts is notoriously fickle. Because of the way US commercial radio operates the scope of music has always been very limited compared to other places like Europe.
Not to say that Europe doesn’t have its own quirks when it comes to the pop charts. David Hasselhoff had 12 albums released in Europe and he had multiple top 100 songs.
A great example of this would be Gary Numan/Tubeway Army. Quite notable in the punk/new wave era but only known for the song “Cars”. I think Devo falls into this category as well. Devo had too many albums and were too influential to be considered a one hit wonder. The fact that Lilly Tomlin booted Devo off the Midnight Special show after seeing the video for “Whip It” adds to the lore.
There is another category as well: Bands that had longer careers with cult followings. Radiohead charted with “Creep” and The Grateful Dead with “Touch of Grey” but I don’t think anyone would categorize these groups as one hit wonders.