From a cbc article on his 2016 human rights complaint:

The ban on blood donations for men who have sexual contact with other men dates back to the 1980s when an outbreak of HIV/AIDS in the gay community prompted panic across the country and health officials took steps to safeguard Canada's blood supply from contamination.

University of Toronto HIV researcher Stephen McCarthy said donor screening remains necessary because while technology has improved, there's still an approximately 10-day lag between the point of donation and the time when disease is detected. Screening donors, he said, helps reduce the risk that a pathogen could enter the blood supply.

"The problem is as good as those tests are… there's a residual risk and we can never eliminate it."

Will 2020 be woke enough to allow a greater risk of HIV to contaminate the blood supply?