Uhh.. Deloitte and Accenture.. not exactly what I would call a good partner here unless you are looking for name recognition at executive level. Is that all that it is?
It's part of enterprise sales which is how Anthropic will potentially be a long-term business.
Who purchases and greenlights adoption? These cycles are very long and partnering with consulting firms gets you cross industry access.
In fact, if you look at basically every major AI/LLM player you'll see a similar "alliance" or "partnership". Its a sales channel of high end referrals.