That Perl.com article you reference states:
Perl 5.12 also enables strictures when it encounters use 5.012

I think the confusion is that the term "strictures" in the article loosely refers to the strict and warnings pragmas, which are part of the Core Perl distribution. The term does not refer to the strictures.pm module, which Corion pointed out is not part of the Core.

Adding use 5.012; will add strict and warnings, but it will not add strictures.

UPDATE: corrected mistake.

For giggles... The strictures, according to Seuss

In reply to Re: Correct way to use stricures in CPAN module by toolic
in thread Correct way to use stricures in CPAN module by cLive ;-)

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