Wikidata statement is referenced, it means to me that the statement as stated can be verified in the reference. Rather black and white; you add a reference to prove that THAT statement is correct.
Apparently not so at Wikidata. When you change a statement and make it more precise, the reference is "still good". So much so that an admin threatens to block because this is so "obvious".
In my opinion, references should always back up the fact as stated. When they did not, they are wrong in the first place. When a referenced fact is found wanting, the old known good is no longer good and consequently there is no point to keep the reference with the improved facts.
When Wikidata is in the business of keeping values that show that at sometime a booboo was made, then I am pretty sure that Wikidata will crumble under the weight of known errors. It is it hard enough to distinguish between facts and fiction it does not need the addition of right and wrong.