No, until now it is only in beta white list preview.
So public preview will be the next step I think.
Yeah, I'm aware of that - the point I was making is that the updated What's New page I linked to has entries for "Amazon Ultra HD support on WiiM App (Public preview)" on 6/25 and "Amazon Ultra HD support on WiiM App (Release)" on 6/30, while it only has "Amazon Ultra HD casting from Amazon Music App (Public preview)" on 6/30 with no follow-up date for its release.
I also notice they don't mention fixing gapless playback for casting AMHD
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