Thank you for your response. I have already tried my best to convince the HR of my implied status but she didn't accept. So atleast I will try to talk to her and get my name off the list of applied candidates, thanks you for your feedback.I will give you my 2 cents about your situations because I was anticipating such thing may happen to myself so I did not submit any job applications since I graduated in May: I would say it is difficult to talk down the HR to hold on to your offer because most companies would not be able to keep a hold on an offer for very long and not to mention that they may have other candidates("second choice" so to speak) that can fit in the position. Besides, no one can tell what the exact date their PGWP gets approved.
If I were you, I would honestly tell the HR about the fact that you do not have the date of when will the work permit gets approved(because I would still want to have a good image in the HR's head), and ask if the HR can pull my name off the list of "applied candidate" so that I can submit my resume to this company after I got my work permit instead of being blocked by their HR system for several months(big companies tend to do this to prevent people frequently applying).
I have a follow up question if you don't mind, I am eligible to get my PGWP for 1 year, so if IRCC is taking 6 months to approve my case, will I then have only 6 months validity when I receive my approval? Will the validity be 1 year from the time I get approved or from the time I applied. Please let me know