Ukraine’s ambassador to Germany did say that regarding Musk’s entry into the fray of warring tactics and/or negotiations. I doubt either Ukraine or Musk originally believed that the Starlink provisions included diplomacy.
Ukraine is getting something and paying nothing, Ukraine can always tell Musk to remove his Starlink. When you are taking something from someone else, it is usually wise to at least show some appreciation and respond politely even if they did not agree with Musk.