I don't recall writing that, though I agree with its broad outlines.
But yes, Disney and others who lobby Congress to extend copyrights beyond all reason have contributed to the problem of orphan works. Orphan works come about when, for example, copyright law extends protection of works whose authors are already dead.
Your comments suggest that you don't really have an idea of the scope of the problem or how it comes about. Every original work--not just entertainment--that is fixed in a tangible medium is copyrighted, automatically, and thus automatically protected for the life of the author plus 70 years. The level of protection for pre-1976 works is a little different, but still far out of scale with the problem copyright tries to solve--namely, providing a sufficient incentive to authors to ensure the flow of new creative works without placing unnecessary restrictions on free expression.