During WW2, the US military made good use of many code talkers who spoke in languages the enemy was highly unlikely to understand, most famously Navajo.

Discussions about this often mention that the Japanese did the same using speakers of Kagoshima-ben, a famously impenetrable dialect:

A local legend claims that this is intentional, so spies from elsewhere couldn't understand it, and this was even put to the test: while the American army employed Navajo codetalkers during World War II, the Japanese navy recruited fast-talking Kagoshima-ben speakers! (Wikivoyage)

As I recall the Japanese used Kagoshima-ben, an almost incognate dialect famously hard to grok even among the Japanese, to encrypt messages (History.SE)

However, I've been unable to find any reliable sources affirming this.

So, did a Japanese military unit ever employ Kagoshima/Satsugu-ben talkers, and if yes, which unit(s) and where?

During WW2, the US military made good use of many code talkers who spoke in languages the enemy was highly unlikely to understand, most famously Navajo.

Discussions about this often mention that the Japanese did the same using speakers of Kagoshima-ben, a famously impenetrable dialect:

A local legend claims that this is intentional, so spies from elsewhere couldn't understand it, and this was even put to the test: while the American army employed Navajo codetalkers during World War II, the Japanese navy recruited fast-talking Kagoshima-ben speakers! (Wikivoyage)

As I recall the Japanese used Kagoshima-ben, an almost incognate dialect famously hard to grok even among the Japanese, to encrypt messages (History.SE)

I've been unable to find any reliable sources affirming this.

Did a Japanese military unit ever employ Kagoshima/Satsugu-ben talkers? If yes, which unit(s) and where?