Just to clear this up
Page 53 of the HCL is actually in a section heading for VTL (and not the NDMP Option section)
What the NDMP column in this section means is that it is possible to attach the VTL to a supported NDMP Storage Array and then use the NDMP Option to backup the storage array directly to the VTL. It does not means the device itself can be directly protected using the NDMP option.
The storage array devices that support the NDMP Option are listed in a different section of the HCL and yes there are no HP devices listed in the NDMP Option section (which starts on Page 127)
BTW the NDMP option (in the Backup Exec world) is a way to move data from an NDMP Option Compatible disk array (as a source) to a directly attached backup storage device (Tape Library or VTL) It is not a way to use an NDMP Tape server as a location to backup any data sources to.
General recommendation when reading the SCL or HCL documents - try not to use search or find, try to go to the chapter or area based on titles or headings. However if you must search then always check which chapter or section you are in.