We think of Magnum, Perle, etc as noble hops because they're German varieties with noble parentage but they're not of the original 4 traditionally grown varieties.
Here's a quote from a Beer and Brewing article:
"The term was created in the United States only sometime in the 1980s and has no technical meaning. It was meant to set apart from the world’s hundreds of hop varieties a select few, venerable Continental European ones with fairly low alpha acid and fairly high essential oil contents. These were initially the German Hallertauer Mittelfrueh, Spalter, and Tettnanger, and the Czech Saaz from the Žatec region of Bohemia."
But, yeah, I think of Perle as a noble hop along with Opal, Saphir, Smargd, etc.