While I suspect your original comment is closer to the truth than the article's (as far as price parity goes), picking a single data point doesn't make the point. It's rare for a drive to suddenly drop in price so significantly without manufacturing changes (thusly a new version of the drive). So while you're unlikely to see the same exact drive for 50% less after a year it's entirely plausible to see a different model, similar or more capacity, drop in price.