OpenPGP Signature Types for Revocations
All OpenPGP signature packets and their meanings are described in RFC 4880, section 5.2 (signature packet), which is the resource you already seem to have found. The relevant signature types are
0x20: Key revocation signature
The signature is calculated directly on the key being revoked. A
revoked key is not to be used. Only revocation signatures by the
key being revoked, or by an authorized revocation key, should be
considered valid revocation signatures.
0x28: Subkey revocation signature
The signature is calculated directly on the subkey being revoked.
A revoked subkey is not to be used. Only revocation signatures
by the top-level signature key that is bound to this subkey, or
by an authorized revocation key, should be considered valid
0x30: Certification revocation signature
This signature revokes an earlier User ID certification signature
(signature class 0x10 through 0x13) or direct-key signature
(0x1F). It should be issued by the same key that issued the
revoked signature or an authorized revocation key. The signature
is computed over the same data as the certificate that it
revokes, and should have a later creation date than that
Signature Type 0x32
A signature types
0x32 is not defined. OpenPGP key servers might contain wrong (and even illegitimate) data, they to not verify it (thoroughfully): this is task of an OpenPGP client. Regarding especially the value 32 as a decimal number, which is exactly
0x20, wrong encoding the signature type magic constant seems not beyond imagination. Do revocations with type
0x32 have anything in common?