My comments were built around a standard relay; the design that will be found in most automotive applications. I imagine there are specific purpose variants in the relay world that I haven’t seen.
Staying with the article, the relay with its pictorial imprinted on it is clearly a standard 87 and 87a relay, each respectively being normally open and normally closed.
The author should have just stuck to a tutorial on crimping connectors. By attempting to gloss over relay function, his inaccuracies will undoubtably cause more problems than solutions.
Larry