VDP documentation says that VDPa supports replication to VDPa?

I know that VDP 5.5 can replicate to Avamar,  but VDPa is still version 5.1.  VDPa 5.1 does not have replicationcapabilities,  but the VDP 5.5 doc says that it does?

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What gives?

Thanks,

-MattG