Its a very loaded and picturesque description to use, but is it an wrong description?
The goal of book burning is to remove information, private owned books in this case, from the public by destroying them. While one could smash them and disintegrate them through the use of massive force, burning was the practical tool used.
If kindle suddenly create a goal of removing information from the public, in this case some private owned books, and goes through this act by destroying the information from private people own devices, doesn't that act align itself perfectly with book burning, through instead of using fire, they used electronic means.
Sure, its not something I would like to see on Wikipedia. Its not neutral, and there are better, impartial wording one could use to describe, but is it wrong to use in a blog?