You are Native Lene... so I trust you! Is this more like an accusation? When looking in my dictionary (statement, assertion, allegation) are all synonyms.
Nah, don't be sorry Lene! As said: I'm not native, and sometimes our words meaning isn't the same as yours, even if one think they are similar. As always, Thanks for your input.
Re. my vote - both statement and allegation would be technically correct - I recommend statement as it seems less formal, and the "tone" of the Danish phrase is quite light, almost joking.