No, he did not. The initial announcement explicitly, if I remember correctly, included the Prime Minister indicating that further details would follow, that there would have to be further development of the program. This was the announcement by the Prime Minister that many of the gaps affecting students, that had arisen as a result of the pandemic, the government fully intended to address, and there would be a program along these lines.
At that point, the public service, and presumably WE Charity, went to work in a vigorous way to design the program in detail, which was then brought forward in proposals by the minister to the COVID committee and later ratified by cabinet.