No, because it is a source filter. It changes source such as:

use Very::Long::Module::Name as Foo;
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to:

BEGIN {*{"Foo::"} = \*{"Very::Long::Module::Name::"}}use Very::Long::M
+odule::Name;
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essentially aliasing the stashes of the Foo namespace with the Very::Long::Module::Name namespace at compile time.

So this is before anything is required under "use"s hood.

Liz