There doesn't seem to be a shortage of $50 bills in Newfoundland - at least, closer to where I live. I went to an ATM yesterday afternoon, and I took money out of the newer Scotiabank ATM, and it did dispense $50 bills (I received a couple, along with a $100 bill, which was the default option). So there seems to be no shortage of $50s and $100s to report in my province.
I am thinking the shortage and hoarding of larger denominations may only prevail in major provinces like Ontario, Quebec and British Columbia, and maybe it is due to lockdowns in many of those provinces. Maybe not so much in Atlantic Canada, and by definition of lockdown, it didn't prevail in my province. Makes sense, since Newfoundland had very few cases (fewer than 300 at this time), and last I read, there are four active cases, all in the lower-populated central region, and none in the Avalon region which is the highest populated region.