I've double checked and while I think it's still perfectly reasonable, it would be more something between $700 and $800. I've made two mistakes: I slightly overestimated the conversion rate from CAD to USD and I didn't factor in the fact that I didn't have to buy a pc case and a power supply.

Ryzen 5 ($140) on amazon

Radeon 6650xt ($229) on canadacomputers

Msi B550-A Pro ($111) on canadacomputers

T-Force Vulcan [8gb x 4] ($80) one pair on amazon another one on canadacomputers

I checked quickly and I was able to fit the rest (SSD, case, power supply) for something around $760ish.

The cpu and the gpu were bought during a Christmas sale and the rest was bought later. This was bought about two years ago (a bit after the time gpus were insanely overpriced).