Uber Software Engineer Machine Learning, Coding round

Have my on-site coming up. There is this Depth in Specialization coding round. My recruiter said it would be backend engineering for me, despite the fact that the role description is about ML. Is this normal? The recruiter doesn’t want to further explain for some reason… What should I expect if it’s backend engineering specialization? The role is in the Michelangelo Canvas team, expected to build solutions around NLP and embeddings.