They did, yes. So if the post had said “Trump marketing reminiscent of Nazi mass murder policy”, it would have been correct.

But it doesn’t - it used the word “slogan”, which implies it was a self-descriptor. The Nazis never used that phrase in reference to themselves, so the post is misleading.

From the substack you linked:

Historians note that while the exact wording “One of ours, all of yours” was not a verbatim Nazi slogan, it encapsulates a Nazi ethos[3]

Again, I fully agree that that the phrase encapsulates Nazi policy quite well, I’m just disputing that it’s a “Nazi slogan”.

The post says “today the Trump admin quoted the Nazi mass murder slogan”. The Trump admin did not quote a Nazi mass murder slogan. So, it’s misinformation.

That particular omnibus seems to be a modern replica:

https://www.coyaltix.com/picnic-wagonpk4/

Some buses of the time period did have a similar multi-floor design. This one is from the 1880s: