[mattynice]

I think completely different publications is a bit exaggerated. According to wiki:

"The New York Times Magazine is a Sunday magazine supplement included with the Sunday edition of The New York Times. It is host to feature articles longer than those typically in the newspaper and has attracted many notable contributors."

I also was curious as to how supplement was defined within the context of publishing and again according to wiki:

"A supplement is a publication that has a role secondary to that of another preceding or concurrent publication. A follow-on publication complements its predecessor, either by bringing it up to date (e.g. the Index Catalogue), or by otherwise enhancing the predecessor's coverage of a particular topic or subject matter, as in the Tosefta."

In my opinion the difference is insignificant.

[SiempreViernes]

They don't seem to share staff though, at least not on the editor level, compare: https://www.nytimes.com/interactive/2019/admin/the-new-york-... and https://www.nytimes.com/interactive/magazine/masthead.html

There's also the obvious difference that one is a newspaper and the other is a magazine; I think it's just a bit unclear what is being meant when they claimed they are "different publications".