As you noted, the SUB plans are not being used at the moment. Part of the reason for this is that we are not using the EI system in the way it's traditionally been used. We have moved people to applying for the CERB through the Canada Revenue Agency or through Service Canada, and moved into that CERB usage instead of the EI system. As such, the idea here really is to make sure that we are meeting the needs of Canadians in an urgent time, suspending some of the ways in which EI has traditionally worked.
I know that ESDC has had a number of conversations around the SUB plan. They are the policy lead for this.