Yes, exactly what I thought. I have not read this House of Commons thing so did not want to give a final word.The section referring to citizens abroad is only for those sponsoring spouses/common-law partners and dependent children. It does not apply to PGP. PGP sponsors cannot sponsor from outside of Canada.
OP, I think you are trying to find references that will allow you to do what you actually want even if they do not apply to PGP. I think the experts here have given the correct information. If still in doubt, I recommend a lawyer. This forum is hosted by one.