Hello, upstream maintainer here.I just want to inform. I don't know how Debian would handle this usually.
The problem is fixed in upstream but unreleased. And this NMU tries to backport the fix. The next Debian release will come in around 2 years. Until then upstream will do a new release.
Because of that and to my understanding there is no need anymore for that NMU and it can be removed from the system.
Kind Christian