I would prefer "We are changing our systems so that in the future we can not remove books from customers' devices in any circumstances."
I don't know that I'd trust the statement after the text-to-speech functionality adjustments on some titles, but it would be a start.
Hey, it's software with compulsory updates via an uncontrollable backchannel. I was furious when I first read about this situation, despite not owning a Kindle (for this precise reason), but I understand the position that Amazon was in.
Hopefully they vet their third parties better, or hopefully copyright law changes in such a way that it is actually possible to vet copyright owners better. Or maybe we just lose the classics because it's too difficult to figure out which heir or organization owns the intellectual property they didn't produce.