Yes, it now supports the same ciphersuites. The MLS spec doesn't specifically mention the secp256k1 curve or schnorr signatures but does leave open the idea of "private" ciphersuites. 

My changes added a private identifier for schnorr signatures over secp256k1 and then I added support to the main library via their default crypto library RustCrypto and I also created a new library to use the secp256k1 library instead of RustCrypto (secp256k1 is the library that all Bitcoin and most nostr projects already use).