"cross-format products" is basically their way of saying "talking book as an app".

You can find lots of these on the App Store; in the days of yore they were also distributed on CD-ROM (as a separate purchase from the corresponding book and cassette book).

One of my favorites is the app for "Moo Baa La La La" which lets you tap on individual animals in addition to the "read-along" mode.

https://apps.apple.com/us/app/moo-baa-la-la-la-sandra-boynto...

So, you could say that this ML product is putting certain software developers out of business.