So... is Landlock finished or not?
YES, it is finished.
Why?
MangaUpdates contains information about the anime adaptation and indicates that it is complete.
Watching Order (by release date)
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Synopsis
The anime Landlock is set on the planet Zer’lue, which is under attack by the technologically advanced Zul’earth army led by Chairman Sana’ku.
Zer'lue is being torn apart.
The only hope for Zer’lue rests on a young boy named Lue'der, who has a unique red eye and possesses the latent ability to manipulate the wind.
Lue'der must learn to control his powers and rise against Sana’ku's oppressive forces to save his world from complete domination.
The story will likely involve themes of good versus evil and the importance of unlocking one's potential in the face of overwhelming adversity.