• The package has not been updated upstream since 2015.
• The package is already the latest version.
  
• The package is still built correctly using the current PKGBUILD.
• The package works!

Because of all the above, there has been no need to update the package so far. And may never be.

Mr.Smith1974 [1] filed an orphan request for sword25 [2]:

package has not been updated for a long time

[1] https://aur.archlinux.org/account/Mr.Smith1974/
[2] https://aur.archlinux.org/pkgbase/sword25/