[LongMan]

If all your 2160p movies are in the same folder, filter for that folder. There is then no need for exclusion.

ie
< ?xml version='1.0' encoding='UTF-8'?>
<node order="10" type="folder">
    <label>20382</label>
    <icon>DefaultRecentlyAddedMovies.png</icon>
    <path>videodb://recentlyaddedmovies/</path>
    <rule field="path" operator="contains">
        <value>movies/2160p</value>
    </rule>
</node>

< ?xml version='1.0' encoding='UTF-8'?>
<node order="10" type="folder">
    <label>20382</label>
    <icon>DefaultRecentlyAddedMovies.png</icon>
    <path>videodb://recentlyaddedmovies/</path>
    <rule field="path" operator="contains">
        <value>movies/4K</value>
    </rule>
</node>

Use option 1 or 2 depending on how you named the folders.

NB Since you are using path contains, there is no need for the full path, only the part of it that is distinct from the other folders

Hope that helps.
Cheers