Even if that was part of some kind of method, it still doesn't sound something a therapist should say imo. I don't think it's helpful at all, it might block the person from wanting to open up more and it's painful to hear something like that.
I also have a T who is very straight forward and not the type that will pamper you (though I'd need that sometime) but I think T's should be supportive by default especially when we talk about vulnerable and painful topics such as sui thoughts.
Sure, they could express the idea that this direction/ thought is not very helpful for the client to stick to, but still remain supportive and not express irritation in any case. There should be some kind of unconditional acceptance.