Yes - this is what I was saying (actually, it only infers it from the point about 'Use timeline settings for output scaling' checkbox). The whole bit about choosing a different resolution refers to the delivery page and simply confuses the issue as yet another override to the timeline resolution setting.
You can see in dimmed text the interpreted output resolution on the delivery page as well so there's no surprise - when set to 'Timeline Resolution' on the delivery page, you can see the output resolution beneath it.
I also finally got around to testing this in v20 and it works as I stated. The 'timeline resolution' in terms of the delivery page is the timeline output resolution (from the output tab under timeline settings).
Also:
waltervolpatto wrote:the thing is, I remember it working correctly and being broken now (19.1.4)……
But I can be mistaken…
Are you saying that it worked in earlier versions of v19 the way you expected? That could have been a bug then. This option to export with timeline resolution is relatively new - maybe it was buggy at the start?