There are very sound reasons to criticize the proposed legislation. For example, the editorial acknowledges that even short stays in solitary confinement can be damaging to a prisoner's health. Yet at the same time the editorial praises Bill C-56 for still allowing indefinite solitary confinement!

Bill C-56 is largely window-dressing. It perpetuates an inhumane practice. It doesn't place ANY limits on the use of solitary confinement. It simply requires a warden to report that its being used, and why. Four years later, Adam Carpay could still be in solitary confinement. All that's changed is that after a couple of weeks, the warden would report that a prisoner is so confined. You can read the facts here:

https://openparliament.ca/bills/42-1/C-56/

Solitary confinement is a violation of Canada's constitution, for reasons I won't go into here. Lawsuits are challenging it in the Supreme Court, and in my opinion they will succeed. Bill C-56 won't change that outcome.