Does the Duck Journal still count Killstreaks?

Ducks were added as part of the Dec 2014 - Jan 2015 "End of the Line" Event.

The Duck Journal itself only counts killstreaks during special events known as a 'Duck Journal Events':

This item has several features, including increasing the drop rate for ducks and displaying a counter labeled Duckstreaks during a Duck Journal event".
_{TF2 Wiki: Duck Journal}

Unfortunately, from January 5th & 7th 2015, the Duck Journal Event has ended, meaning that ducks no longer drop, and kills do not count towards a Duckstreak:

January 5, 2015 Patch
[Undocumented] Ducks no longer drop after a player is killed.
January 7, 2015 Patch
[Undocumented] Removed Duck Journal event from the main menu.
[Undocumented] Removed the Duck Journal from the Mann Co. Store.
_{TF2 Wiki: Duck Journal}

However, the Duck Journal is not completely useless. It can still be used as a Noisemaker:

...using an equipped Duck Journal with the action item button will cause one of several Duck Collectors Bumper Car game quack sounds to play. This action is available at any time, independent of events, with a cool down period between quacks.
_{TF2 Wiki: Duck Journal}

There are also some that believe another Duck-related event may occur in the future.*

_{* Such an event would be quite specquackular!}