He doesn't really use the reliance argument. Whether dropping the pause was the right call is a separate question from whether people were allowed to rely on it. They were: the v1.0 language alluded to a much higher bar for changing commitments than they ended up applying, and Anthropic employees described the RSP as binding many times (Habryka says he heard it on more than a dozen occasions). Also, Hubinger's post announcing v3 says Anthropic is responsible for that impression. If you made vendor decisions based on that like the author did, the complaint is still valid, even if the change itself was the right decision. Both can be true at the same time, they were right to change it and you were right to feel misled.
He doesn't really use the reliance argument. Whether dropping the pause was the right call is a separate question from whether people were allowed to rely on it. They were: the v1.0 language alluded to a much higher bar for changing commitments than they ended up applying, and Anthropic employees described the RSP as binding many times (Habryka says he heard it on more than a dozen occasions). Also, Hubinger's post announcing v3 says Anthropic is responsible for that impression. If you made vendor decisions based on that like the author did, the complaint is still valid, even if the change itself was the right decision. Both can be true at the same time, they were right to change it and you were right to feel misled.