Supported Proxy Re-Encryption schemes

Hi, I have a question about PRE schemes.
The github says that the library supports PRE for BGV, BFV, and CKKS, but in the docs, there is only one paper about PRE, which uses NTRU and BV.
I would like to know if the library uses non-published schemes for (BGV, BFV, CKKS)-PRE or if it uses standard FHE key switching as proposed in Gentry’s thesis?

OpenFHE implements the PRE variants that are not currently published. We will make a paper on these publicly available later this year.