That's definitely not true, unless in some special context.

I'm not sure about English, but "simple majority" and "absolute majority" are commonly used to refer to a plurality and >50% respectively in German.

Wikipedia [0] also recognizes this meaning.

[0] https://en.wikipedia.org/wiki/Simple_majority

The Wikipedia article indicates that simple majority may refer to majority, plurality, FPTP, or super majority, indicating no preference as to which might might be the most commonly understood.

A "simple majority" means 50%+, not a mere plurality (its the same as just a "majority", it's generally used to contrast with a supermajority.)