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There's no requirement to provide a list of the copyright owners. The licenses require you preserve the copyright notices and the authors have chosen to refer to themselves as "The Go Authors" or "The Android Open Source Project" so you just have to preserve the notice as is.
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It's just a shorthand to refer to the overall group of authors since Google only owns a large portion of the code rather than all of it. It'd be very impractical to list out each owner especially as it moves across files and this makes it much easier to comply with the license.
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The header at the top of the files is also just a reference to the actual copyright notice / license. It's strictly required to have the actual notice intact. The file headers are only there to make it easier to follow the licensing. It's the LICENSE file that actually matters.
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Lots of projects have a "Copyright (C) 2021 Author" notice despite having a bunch of other copyright owners. It doesn't mean people don't still own their code though. Google is doing it the way they are because their lawyers want it 100% accurate with explicit authorization.