OPDS 1.2 is a standard for delivering content to e-readers. It is supported by many e-readers and can be used to read the comic book series.
You can read it on your e-reader by subscribing to the OPDS 1.2 feed available at
https://www.cathrynedelamort.com/hidden-signals/opds-1-2.xml.
OPDS 2.0 is a newer standard for delivering content to e-readers. It is supported by many e-readers and can be used to read the comic book series.
If your reader supports OPDS 2.0, you can subscribe to the OPDS 2.0 feed available at
https://www.cathrynedelamort.com/hidden-signals/opds-2-0.json.