What you’re missing is his actual job history, identical on both resumes, he was applying for a luxury hotel customer service position, and had many years of exactly that experience, unless three other people with more experience than him applied and one of more dropped out, it makes no sense he was looked over, and then interviewed. That’s what pushes this from a case of maybe racism to a lawyer accepting the case because of the very strong evidence of racism.
And even if it was a case of two three people having more experience on their resume, and then dropping out, why wouldn’t the hiring manager scheduling the interview tell him that, and why did he pick the newer resume over the older one with exactly the same experience, it doesn’t add up. Resumes are usually organized oldest to newest, relevant job history greatest to least.