When doing a console based database upgrade, Piwik is used insterad of Matomo.
Confirmed in Matomo 3.5.0 and 3.5.1

See file plugins/CoreUpdater/Commands/Update.php on line 42, 68, 252 and 374

    *** Mise à jour ***

    Mise à jour de la base de données requise

[...]

Piwik has been successfully updated!