Claymore Dev is not dead just changed its name to Phoenix Dev It's just the same person just a different name I guess Best wishes for 2021 people ....
I don't think so. Years ago Claymore and somebody from Phoenixminer was arguing on Bitcointalk and accusing each other from copying kernels.
We still maintain and develop PBE and it supports most of the Polaris cards. Download from Github or build from source code.
https://github.com/IndeedMiners/PolarisBiosEditor/releases