PGP String-to-Key specifiers
Yes, it's still talking about the case where multiple hashes are needed to get to the key size. Such a function is called a key expand function.

It explains that they are taken independently (different contexts) over the passphrase (the data). A different context means that the calls to the hash functions don't interact; $H$ is seen as a single call to a complete hash function.

For example, with a 160-bit hash (e.g. SHA-1) and a 256-bit key, you would concatenate $H(p)||H(0x00||p)$, then take the leftmost 256 bits (i.e. discard the rightmost 8 octets).

If you needed a third hash block, that would be $H(0x00||0x00||p)$, etc.