iPhone 12 Pro Max optical zoom confusion

I'm a little confused as to the capabilities of the iPhone 12 Pro Max optical zoom on the telephoto lens. During the presentation, it was stated that:

"We have a brand-new Telephoto camera with a 65 mm focal length. Moving from a 52 mm focal length to a 65 mm allows for longer framing in the classic portrait style. With the new Telephoto, you can now optically zoom in two and a half times for even closer shots or tighter crops, which means improving to a 5x optical zoom range from the Ultra Wide's 13 mm to the Telephoto's 65 mm."

So...does this camera have 2.5x optical zoom or 5.0x optical zoom on the telephoto lens? The tech specs on Apple's page say "2.5x optical zoom in, 2x optical zoom out; 5x optical zoom range" on iPhone 12 Pro Max. What's the difference?