I agree with both your points. To be honest if the same signal is sent by merely confirming employment dates but not literally disparaging the former employee, I fail to see how there’s any additional legal protection. The implication is tortious interferus in both cases.
That's why many companies don't give any details at all, whether positive or negative. This way your line of argument doesn't apply; not from a logical point of view and also not from a legal point of view: no signal is sent at all.
