That was sort of the intention of the previous Bill C-56, which clearly stated that it was prohibited to place individuals with mental health problems in segregation. That prohibition no longer exists because it is expected that inmates could spend at least four hours outside their cell. At the same time, I think that remains a very restrictive environment for someone suffering from serious mental health problems.
As it is not exactly known where those new structured intervention units will be located, it is relevant to wonder whether inmates could have a therapeutic environment. So far, we don't know whether the segregation areas will simply be restructured and renamed.