Clarification on the two "privacy-preserving crypto" traits vs the other "supports key type" traits

Hi all,

Just another request for clarification -- the phrasing of definitions for traits [Privacy Preserving Crypto - BBS+](https://identity.foundation/did-traits/#cryptographyPrivacyPreservingBBSPlus) and [Privacy Preserving Crypto - niZKPs](https://identity.foundation/did-traits/#cryptographyPrivacyPreservingNiZKPs) versus the phrasing for those of the other "supports key" traits (e.g. [EdDSA, curve ed25519](https://identity.foundation/did-traits/#cryptographicAlgorithmEdDSA25519))

The phrasing for cryptographyPrivacyPreservingBBSPlus and cryptographyPrivacyPreservingNiZKPs are both "A DID method’s ability to use cryptographic techniques that...", suggesting that the DID plays a more active role in those cases than simply being able to represent a particular key type in the DID document. Is this the case? If so, what is required of the DID method to "use those cryptographic techniques"?

Thanks!