Manufacturers DO publish reports. Tesla routinely provides data about the lifetimes of their vehicle batteries, which turn out to greatly exceed their warranties. (This shouldn't be surprising to anyone. Manufacturers just can't afford to have high warranty return rates).
The rest of your post is an attempt at hand-waving away what is a real phenomenon. EVs are still new to a lot of people, there's a lot of FUD floating around, and that can affect used vehicle prices. Markets behave irrationally sometimes, and that leads to opportunity. (In this case, getting a value buy on a used EV).
> hybrids are still obviously better
Hybrids are objectively worse. They have less all-electric (efficient, non-polluting) range, they charge more slowly, they have a more complex drivetrain with more parts subject to repair, etc. They're a better fit for a specific market segment, but that segment is small and rapidly becoming non-existent. You can get cheap EVs nowadays that have more range than my last ICE.