[samstokes]

It's only applicable to those folks who have been on H1B over 6 years and have applied for permanent residency.

I read it as over 6 years or applied for permanent residency:

""" Eligible individuals include certain H-4 dependent spouses of H-1B nonimmigrants who:

- Are the principal beneficiaries of an approved Form I-140, Immigrant Petition for Alien Worker; or

- Have been granted H-1B status under sections 106(a) and (b) of the American Competitiveness in the Twenty-first Century Act of 2000 as amended by the 21st Century Department of Justice Appropriations Authorization Act. The Act permits H-1B nonimmigrants seeking lawful permanent residence to work and remain in the United States beyond the six-year limit on their H-1B status. """

[ojbyrne]

The only way an H-1B can stay beyond six years is if they have applied for permanent residency.

[samstokes]

Yes, but the converse is not true - you can apply for permanent residency having stayed for less than six years.