Dude, I saw you in earlier threads and what people here answered you are correct. Basically, you must apply for a restoration of study permit and post grad work permit at the same time. Did you search this forum as one suggested, or if you can't do that, talk to a lawyer as another one said?
It's ironic that you've already secured a job, which most people struggle to do. Don't let the opportunity slip away and waste 6 years of your life.
The worst case is to apply for another study permit, short one 6 months maybe. After that you can apply for PGWP again, and it will be valid for 3 years.