What exactly was “‘dotty’ and ‘dashy'” Morse code?

During early World War I (1914–1916), Germany briefly experimented with ‘dotty’ and ‘dashy’ Morse, in essence adding a dot or a dash at the end of each Morse symbol. Each one was quickly broken by Allied SIGINT, and standard Morse was restored by Spring 1916.

Source: https://en.wikipedia.org/wiki/Morse_code#Unusual_variants

Emphasis mine.

That’s all it says on that Wikipedia article. It makes no sense to me. It’s implied that this was supposed to be some kind of encryption/cipher addition, but how is “adding a dot or a dash at the end of each Morse symbol” anything but “slightly incompatible” with the existing system? Something is not being told in that brief description.

Sure, it was ~1915, so they didn’t exactly have advanced computers yet, but what’s said above is at the level of what a child would come up with to “talk secretly” to their sibling without their parents understanding. Cryptography surely had existed as a concept (if only done with pen and paper, or with crude machines) for a long time by that time?