First of all, I'm the OP lol. And I haven't travelled to Canada since the pandemic happened. But I believe waiting for POE and cancelling your flights/hotels just because of POE is not a good idea. Of course, if an individual is not comfortable traveling without POE, then sure wait. But I would suggest please contact Canadian High Commission of your country (delhi in my case) and also contact CBSA too.
I personally didn't receive any POE for study permit (SP). I just got one POE for WP (I'm in a co-op program). And because of this issue, I contacted Canada High Commission, Delhi and got this response from them in-written:
Thank you for your email. This is in response to your recent email enquiry to the Migration Section of the High Commission of Canada in New Delhi.
Port of Entry introduction letter is not required for you to travel to Canada. The information about your permit is in our global computer system and can be accessed by immigration officials in Canada. Please proceed to travel to Canada within the validity of the visa placed in your passport, your permit will be issued upon your arrival in Canada.
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Moreover, I called CBSA and they confirmed the same thing. So, it's all good.