It looks like you will have to have another review campaign to test changes and integrated improvements

They may or may not have another review campaign. But right now they have got a lot of reviews, around 100 I think, and it is now time for them to read and analyze each one of them, see what are opinions of the people, what things they have done well in their product and what features needs to be improved.
If they focus on the details and upload new improved changes to their Mixin Safe ecosystem, it will further become a good product.