Question about Ubuntu support

[Hello]

hello,

There may be an straightforward explanation for this, I don't know.
I plan on installing ubuntu 18.04.x  LTS.


Links 1 & 2 below say ubuntu is supported for 5
years (from release date).


But ubuntu spins/flavours, e.g. links 2 ,3
and 4 below  say that one only gets 3 years of support.


Any extra information I may be missing would
be helpful in discrepancy in years of support.


Thank you,
F-



#________ (1)
here, 18.04.04 LTS supported till April 2023 :
https://wiki.ubuntu.com/Releases


#________ (2)
Under the column 'Public support until' it
also says desktop and server supported till  2023-04
https://en.wikipedia.org/wiki/Ubuntu_version_history




#________ (3) with MATE
here, 18.04.04 LTS is only supported till April 2021
https://ubuntu-mate.org/download/amd64/


#________ (4) with XFCE
here, 18.04.04 LTS is only supported till April 2021
https://xubuntu.org/release/18-04/

#________ (5) with KDE
here, 18.04.04 LTS is only supported till April 2021
https://kubuntu.org/getkubuntu/