If it's OpenRewrite recipes (not just the AI) making those Java upgrades happen, then Amazon should say so. A quick google search suggests that's likely based on AWS documentation. Nothing wrong with that approach, but it's a wordy announcement to be leaving out such an important clarification.
“4,500 developer years” saved is definitely a meme-able line from this clown.
This is nothing but puffery and a sales pitch for their ChatGPT wrapper.