Hello Nuclidex
As far as the first link goes, I couldn't get it provide any info and the 2nd link had nothing relevant for 2013 or beyond.
Here's the info you're asking about from a trusted source (Robert Sparnaaij) who is a Microsoft MVP with primary focus on Outlook). Now, the focus in the article is for Outlook but the dates apply to the full Office suites since there are no separate end-of-life dates for individual Office components.
How long is my Outlook version still supported?
https://www.msoutlook.info/question/microsoft-o...
Another link that corroborates the above dates in case you needed it
End Of Life – Microsoft Windows and Office
https://michaelspice.net/windows/end-of-life-mi...
Required Forum Disclaimer: The above links are non-Microsoft websites. The pages appear to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.