For example, media sites such as Nekki and UpMedia will pop up a reminder when no new content has been added to the page, even if the net added text is not empty.
In that case, you can add one additional conditon, “Text -- does not contain -- no new content has been added”.
Assumption: The selection that you need to monitor has some text, like “no new content” when the net added text is empty. If this is not the case, an image will be helpful.
Based on the above assumption, your condition looks good. You will need to change the text to the text that shows up when no new content is there.