10 GB/s refers to the throughput or the rate at which the PRNG can produce random data.
A Bitcoin private key is a 256-bit (32-byte) number. This is the size of the data required to generate one Bitcoin key.
You would need a PRNG or hardware setup that can generate random data at 320 GB/s to achieve 10 GK/s.

P.S. Xoshiro256plus could achieve the required throughput of 320 GB/s with 128 cores.

Do you consider generating an address to be the same as generating a random number? What about the other parts? hashing, Elliptic curve ,...?