While I agree – and have experienced the same frustration as you when my notes are not considered “evidence” on a par with my photo – I can see why “audio confirmed” would not be useful to some identifiers anymore than “visually confirmed” would be in an observation without media. Notes are (hopefully) taken seriously when they describe what was seen or heard in a way that can be evaluated.
What was the habitat here? We see a white background and some grass. Some notes about the habitat would be useful here, considering that this is during the breeding season when Empids are on their characteristic habitats.