I unfortunately don’t have an exact answer to my question. But I was able to resolve my issue by starting from scratch, and using this plugin as a guide: Custom List Table Example The plugin contains just one PHP file, which creates a new admin page for you, and adds a full admin table. The PHP file is very heavily commented, and serves as a tutorial for exactly how to use the WP List Table class, and its methods. It explains exactly what each method is, whether it is required or not, and what features it adds. It was very helpful. This was by far the best and most practical of all the WP List Class tutorials I found online.
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