Yes, I was making fun of the idea that it was malice aforethought by implying that Amazon isn't aware of DeDRM tools.
You can read that as "they weren't actually paying attention to the Tools, to the extent that their knowledge or caring might affect the matter".
In order to claim hostility, I would have to see some serious changes. Changes that
look deliberate, and require significant functional modifications to the Tools to compensate. Maybe even going so far as to rewrite the K4PC key derivation code entirely.
We've all heard of the epic struggle with Apple.