Hi.
I worked with Genasi to design the upgrades for the Abbot and Reaver's Fate loot. Though not all of my ideas went through in their original form, as this was a team effort, the upgrade to the Quiver of Alacrity is exactly how I intended it to be.
I know full well that it has no minimum level, and has never had one.
We're not planning on changing it, nor has the subject ever even come up.
The entire point of it is that the upgraded version of this item is a fantastic convenience to a TR who has put the work in to get and upgrade the quiver.
So for Celestia's sake, you can all stop the wild rumor-mongering now.
If you see something in patch notes, it's official. If you don't, it's likely not true.