Again, I'll state the agreement. It's legally redundant. Charter section 11, provision 11(i) already prohibits retroactive punishment, and all new legislation is prospective by default unless it explicitly states otherwise, which this bill does not. Codifying prospectivity on the face of the bill could invite litigation over the line between clarification and limitation, potentially narrowing the bill's reach in ways Parliament may not have intended.
That said, if the committee views it as a pure housekeeping and an important measure, while it has no substantive effect, I don't have a serious objection to it.