Probably some form of ablation [1] e.g. [2]. This is typically done by identifying the direction that the refusals/political alignment is represented within the model's weights and then reversing that direction.

[1] https://en.wikipedia.org/wiki/Ablation_(artificial_intellige...

[2] https://arxiv.org/abs/2603.04355 -- Efficient Refusal Ablation in LLM through Optimal Transport

It's the company's whole product offering, so I guess they probably should be definitive about it