From the article referenced in the above article:
“Though mark selective fisheries are meant to allow harvest of relatively [abundant] hatchery fish, all selective fisheries have an associated mortality on unmarked (wild) fish and in cases where a mark selective fishery is not properly designed, implemented and monitored, this mortality can exceed that of a non-selective fishery,” Jordan said.
Looks to me like DFO is thinking a MSF should look very similar to what we have in WA; heavy emphasis on "properly designed, implemented and monitored".
Plenty info about the gory details on the web if one cares to look. You can start from the ground-up by reading the sections on MM & MSF in the latest PST. Our most recent MSF in Puget Sound got closed 18 days into what was supposed to be 90 days due to too many unmarked/undersized fish being caught. We went from over 20 MSF's in 2019-2020 to 5 for 2020-2021 because the wild populations are too small to support any fishery - FYI down here it is a total fishing closure versus non-retention as in BC.
IMO statements like MSF's have limited/minimal/less than 1%/zero impact on wild runs does not help our cause.