Possible to detach a database from SQL Server while retaining file permissions?
While not a concrete answer, I find no configuration option or setting to override this behavior.  It seems to be baked in.

Everywhere Detaching and Attaching Databases is mentioned in the documentation points back to the Securing Data and Log Files page you referred to above.  The scenario on this page makes it pretty clear what is going on, and why the files should be secured as such.

Perhaps you could use a different user or service account to perform the operation?  IF the file is owned by the proper account (such as the SQL Server service account) this whole thing may be a non-issue.