This example says:
"A piecemeal restore sequence restores and recovers a database in stages at the filegroup level, beginning with the primary and all read-write, secondary filegroups. "
This statement is wrong. Even step 2 of the example shows this.
You bring online PRIMARY and it is all you need in order to get access to that data (database metadata tables).
Using online recovery allows to bring online any other file group, read-only or read-write.
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