Yeah, it's pretty much flat-out wrong. Especially when you consider that here in Germany we have a hard-left party - Die Linke - which sees itself as standing in the tradition of socialism in the proper sense of the word, and has a large fraction of members openly pushing that sort of ideology. And that's not even mentioning the deep and bitter historical rifts that still are present today. Wer hat uns verraten is something those people take seriously.
Yes, Sweden has several socialist parties as well. Having several parties that are all different brands of socialist does not make any of them not socialist. We also have several liberal and conservative parties.
Socialism means wishing to subjugate the bourgeoisie. Nationalization and markets as the exception and not the rule are necessary characteristics; after all, we should strive for a usage of the word that aligns with 150 years of Leftist thought, including Marx.
The 150 years of usage of socialism includes it's usage in social democratism. The social in "social democrat" means
socialist.
Social Democracy on the other hand means accepting reformism as the most successful road to the people's welfare, and in the process giving up on revolution - whether political or economic - as a viable instrument.
Democratic socialism is the result of the split between democratic and revolutionary socialists. Democratic socialists favoured change through reforms and democratic opinionising instead of violence. This does not make it not socialism, except maybe for people who have an Ayn Randian view of what socialism is, like "subjugating the burgeoise".
If you subsume my Social Democacy under your Socialism, you end up with the weird result that there is not a single position that all those you would describe as socialist could agree on, apart from 'It's good to help the workers and the poor'.
Yes, socialism is an extremely broad category of thought that has historically been very prone to splintering and infighting.
And I have absolutely no doubt that your social democracy would not be covered under it because I have seen absolutely no signs through our history on this site that you are in any way social democrat.
Fun fact though: Your own party have no trouble
subsuming themselves under socialism alongside just about every other socialist party in the world, be they revolutionary or democratic.