Sorry for the late reply.
Yes I believe these are the correct ID’s. I’ve just doubled checked them and there is a sub field called link, however the target and title is provided by setting the field type to Link. The input on a post using the custom field would show WordPresses’s standard hyperlink window which in turn would provide data for the link, target and title fields.
I took a screenshot of the custom field post input options here:
As well as a screenshot of the custom field setup in the ACF plugin here:
Perhaps that provides a better idea than my description?
If nothing jumps out at you, it might be time to try a different approach rather than using the repeater field I’ll try to get this working with a single entry.