2 different things with different specs/speed
Parallel to USB? That's two different ports, with vastly different speeds and different specs. There are adapters for this.
standard parallel port: 115kBYTES/s (.115MBYTES/s)
Original USB: 12Mbits/s (1.5MBYTES/s)
ECP/EPP parallel port: 3MBYTES/s
Or for USB to PS2. Or USB to seriel. Or USB to SCSI. That's why they are adapters, to adapt one thing to the other. Though, AFAIK, he is correct, there is no such thing in this case.
\Dan