Thanks for pointing that out. The real ad appeared in the computer magazine Interface Age, September 1976 page 13, as can be seen in the Internet Archive. I think it's important for Hacker News to avoid fake/replica historical info so it doesn't end up like Reddit, where you can't trust anything.

https://archive.org/details/InterfaceAge197609/page/12/mode/...

Yes. Numerous typos were introduced, Even misspelling "Palo Alto".