I looked at what I could about the courses on the "Developer" path (mostly just the titles of the different sections of each course), and there's obviously a very heavy focus on AWS ML services. Also my general impression is that the courses are too short to actually cover in depth what they say they're covering. Probably good for an overview.

I haven't looked in detail but the description strongly suggests an applied ML focus (which would be very typical of IT certifications in general). In AI/ML, there's some overlap between applied AI and research AI--e.g. you're going to want to know something about statistics in any case--but I'm not sure the distinction is always appreciated.

Is there a cert to go along with the courses?

Some online courses or groups of online courses have certs associated with them. Some don't. Whether those certs are worth anything from a job hunting perspective is going to depend on the cert and who is looking at them. Very situationally dependent.

I was specifically speaking with regard to this offering. AWS has a pretty mature certification program (though I think was recently outsourced), so I figured they would have some sort of certification track to motivate people to consume their educational resources.

Checked out data science, there's a good amount of general stats in there. It's also in their interest to educate people so that they could become customers once they understand the basics/theory.

There is a "Math for Machine Learning" course.

I just flipped through that course. It covers just vectors, matrices, probability, and derivatives. A better (and faster) resource is to use chapters 2-5 of Deep Learning by Goodfellow et al, but the mathematical detail in that book may be offputting for beginners.

I agree with your comment. The AWS course recommends that you should skip the class if you either minored or majored in math.