1. 5500 PNP nomination is the quota for Ontario for all type of nominations (including French speaker, graduates or others). Human capital will be most likely even lower than 5000 applicants
2. When reading assumption on the article, I do not think, that Ontario will have that many problems to keep their PNP inside their province. In order to pass such law they would need some amends of federal laws as well.
3. 450 cut off would be a bit too high. By best guest it can be somewhere 420 and 440 (depending where the ITA will stabilize). Or they can also opt for In demand list or for some kind of mixed option.