I can't believe you believe this yourself
How should AlphaGear hide your gear if it's not installed? If you remove the addon the game won't load it and your gear won't be touched at all.
Gear = items and addons cannot manipulate items, or hide them, at least not as the addons are deactivated.
To contact the author write to the addon comments. Always go there for the first contant to any addon.
I cannot see a single post from your side there so far so not sure what you meant you tried to contact the author(s)?
You could even write a PM to mesota there by clicking his name from the author list and choose "Write pm".
https://www.esoui.com/downloads/info....html#comments
About your gear:
Items cannot be destroyed without showing a "Do you want to destroy this, then type DESTROY" popup dialog.
You need to manually acknowledge this, and on a "per item base".
So if you did not see nor do this no addon destroyed anything.
I guess your gear was just sold or deconstructed by yourself then if it's not anymore in your bank etc.
And all the gear items you cannot see without AlphaGear: Disable ALL addons!
Check your inventories and you'll find them. I guess another addon just hides them, so test without ANY addon and you'll see.
If it's there with AG it's there w/o for sure!