Why does redshift use the deleted file /memfd:pulseaudio?

I ran a rkhunter scan (sudo rkhunter -c --enable all --disable none --rwo) and it showed me that redshift is accessing a deleted file. I'd like to find out why it's doing so and why it would need access to anything related to audio. The output is: Warning: The following processes are using deleted files: [...] Process: /usr/bin/redshift PID: id File: /memfd:pulseaudio. This file has been accessed before but I don't know if that was redshift too. Edit: asked about it at the redshift repo now