If you're hit with an algorithmic link penalty, you'll receive a message in Google Search Console.

This statement is FALSE. Google Search Console (GSC) only sends messages for manual link penalties. These are actions taken by a human reviewer at Google when they detect violations of their Webmaster Guidelines, such as unnatural or manipulative link building. Algorithmic penalties, on the other hand, are applied automatically by Google's algorithms (like Penguin) and are not communicated via GSC messages. You would typically notice an algorithmic penalty through a sudden drop in rankings and organic traffic, requiring an audit of your backlink profile to identify and disavow problematic links.