As an Irishman, both announces and announce sound fine to me.
As a fellow Irishman, he's referring to the misspelling at the top of this submission :)
The submitted title was "Apple Annonce 1000 New Irish Jobs", but it shouldn't have been editorialized in the first place, so we've changed it to the article title.
"Apple Announces" (as in the original arrtical title) is correct since Apple, the company, is a singular entity (and would still be even if it was called "Apples").
"John announces", "the boys announce".
"Annonce", as in the current submission title, is doubly incorrect.
Depends on British English or American English. British English generally considers companies to be collections of people e.g. ‘Apple announce that’ in the same manner as a sports team e.g. ‘Arsenal are winning’.
You're right - it seems there is a little more leeway here. "Annonce" (the typo) was what the parent comment correctly pulled up, but the original form of the verb should have been maintained in any case.