no tool - not even GSC - picks up (or rather shows) 100% of the backlinks, so it's possible that you may never see that backlink in Ahrefs even though it does exist and might even be indexed by google, so don't stress about it! That's one thing.
The second thing: I don't fully understand your question. What does getting approved by GN have to do with building links to parasites?? I'm really not following...