If suicidal ideation is a sign of clinical depression, does that mean that we can take the contrapositive and say that healthy people think about suicide very infrequently?

Sure, probabilisticly: healthy people probably think about suicide much less, on average. There are exceptions, obviously.

but is there room to talk about suicide without that "maybe get help plz" disclaimer?

Talking about suicide is not at all the same as suicidal ideation. Also, I'm not at all averse to this discussion. A disclaimer doesn't prohibit a conversation.