To be honest, these numbers are hardly from scientific papers and don't offer a ton of detail, but they are from fairly reputable sources like NPR and the ACLU. I did see a couple of references to people under 25 and over 65 being the most affected which makes sense.
After looking into it more, I see that banning cashless is a lot more common than I thought in the US and most major cities have done it. I wonder if that's the way it will happen in Canada, if at all.