Terms such as "mixture of specialists" are already common for AI tech.
The idea of an "AI agent" is to anthropomorphize. You don't call workers domain-specific humans.
It sounds like a strange choice. That's why I asked. Of course it's not related to domain specific languages.
I don't think a direct similarity with domain specific languages is evident to me. I rather find the messaging similar to some "agents" from other domains. e.g. https://www.harvey.ai/