Except nobody is buying 500 GB laptop hard drives, unless it's a replacement part. So, this is pretty irrelevant.
We've been through this before: the cost-curve of HDDs flattens out at the low end, while it remains fairly linear for SSDs. In a HDD, you need a sturdy enclosure, actuator, spindle motor, bearings, and at least a couple read/write heads + platters, no matter how low-end it is. That puts a price floor under HDDs, where as SSDs are as cheap as a PCB and the chips on them can get. So, it's essentially meaningless to look at price-parity of bottom-tier HDDs, because nobody is buying those on a $/GB basis, anyhow.
Please focus on HDD capacities people are still buying. Also, HDDs can retain data in a powered-off state much longer than most modern SSDs. So, there are further reasons someone might prefer a HDD (e.g. for backups), even if GB/$ were the same or lower.