Government Events interview questions

Initial screening call / light touch interview with HR, followed by x1 virtual interview with two would-be superiors, and x1 in-person interview with four people. Second round interview involved presentation based on task. Offered me job I accepted, then revoked job offer once I asked for a conversation about reasonable adjustments for disability. They said offer was revoked on grounds that there was suddenly no budget for the role. I believe I was discriminated against but no way to prove this. Job advert was re-published on a popular job site after job offer revoked.