It's not really surprising. Developing a macOS SDK for letting developers load their whatever on a PCIe-mounted FPGA is a huge undertaking, only done by those manufacturers of FPGAs (and not for macOS). There really isn't any market justification to build that for what's effectively a glamour product.
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The SDK is for third party apps to make use of Afterburner's existing codec acceleration. There was never any mention by Apple of any other use.
Sadly. I was waiting for it too.
https://support.apple.com/en-us/HT210748
It's not really surprising. Developing a macOS SDK for letting developers load their whatever on a PCIe-mounted FPGA is a huge undertaking, only done by those manufacturers of FPGAs (and not for macOS). There really isn't any market justification to build that for what's effectively a glamour product.