You could also use this undocumented command with pkgutil to expand all the payloads without having to go through any install process; pkgutil --expand-full <input pkg> <outdir> (the output directory needs to be nonexistent)
About to do this on M1 with the new HD!https://twitter.com/ThermalDOE/status/1331532753045741569 …
Here’s a short guide on how to install HomeDiags to Big Sur with the new mount issues (Warning: not beginner friendly. DM if you need help)
1. Right click on your pkg and click show package contents
2. Open each pkg that it contains by right clicking and opening once again 1/? 
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Also, once you run that, right click/show package contents on all the newly created .pkg’s, all the files with then be exposed within the “payload” directories
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