All the statements you provided about the Pacific Ring of Fire are generally true. Therefore, if you are looking for something that is not true about the Pacific Ring of Fire, you would need to provide additional information or specify a different statement.
The Pacific Ring of Fire is indeed an arc of intense seismic activity, it does include the northern edge of Alaska, it is a zone of frequent earthquakes, and it is the result of plate tectonics. If you have specific alternate statements in mind, please share them for clarification.