"Protecting artists" is not something they claimed as if they were opposed to AI usage at all. In their press release they said:
> It is Getty Images’ position that Stability AI unlawfully copied and processed millions of images protected by copyright and the associated metadata owned or represented by Getty Images absent a license to benefit Stability AI’s commercial interests and to the detriment of the content creators.
It's clear from this that the issue was not that Stability is an AI company, but that it's unlicensed. Getting an exclusive license to the images is specifically what they pay contributors for. Having those copyrights infringed by a competitor makes the content less valuable to Getty, and disincentivizes Getty from paying for new content in the future.
So yeah, it's plausible that this behaviour from Stability could harm content creators. Not because it's AI, but because its just run-of-the-mill unauthorized usage.