The linked sound mod seems peculiar to me, because in the A1-AV8BB-NFM-000 manual you can run a search for voice warning, and there are many mentions throughout, say for WATER WATER, or MANUAL FUEL, etc and the aforementioned mod has a set of mostly tones, whilst I'm not saying these are necessarily incorrect; (if the tones do exist aboard the AV-8B) they're most likely accompanied with the relevant voice warning.
As for dates on completeness, these as I'm sure most will appreciate would be fluid; programming something as complex as this is rarely plain sailing (flying?) You could look to their known bug list for perhaps a crude/approximate indication.