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I just watched it and they don't say anything about that. In fact, they say the exact opposite. They say even Mac frameworks are running under Rosetta, which suggests they have no ABI shim layer *at all*, and instead adapt at the syscall layer. So it's even worse than I thought.
They talk about App Extensions, but those are out-of-process (e.g. AUv3). It's clear from that video that the Rosetta architecture boundary is the process boundary. VSTs are not out-of-process. There is nothing there at all about this being even possible to manually develop.
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