That's because the original route was payware, so any modifications and releases of payware routes will say 'modified, payware' or 'installed from DLS, payware' just to indicate that its payware.
This will also apply to any DLC's that are modified from N3V's store and shared. The original DLC must be installed and active before the modifications will work, else it'll fail since you don't own the original, or don't have it installed.
That's one of the best features about TRS19 is that you can modify payware routes and share your edits (granted its from N3V, Steam, or the Mac store).
Cheers