That sounds reasonable and I can understand the decision.
theguardian.com only gave us this for context:

The chorus of Conte’s empowerment anthem contains the phrase “serving kant” – a queer or drag slang phrase roughly meaning “to express boldness”.

With the abundance of languages in the EU I imagine that allows us to find quite many words that are phonetically similar to rude words of other languages.
Wouldn’t it be fun to see if it’s only the English language that are afforded such privileges of denial?

On the other hand I don’t really care what happens in the eurovision song contest.