Website redesigns rarely focus on the data, and it regularly unfolds because the "design looks a bit out of date" or the "technology is not fit for purpose".  Redesigns don't often lead to an optimal solution because stakeholders cannot agree on the best approach. As a result, they reject the entire existing site and start again with little effort to isolate the original problem.
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By doing this, there is no way of knowing whether all the effort and money pumped into the redesign was worthwhile until the website gets launched. With the correct metrics set up, only then can you observe the performance of the new site.  Is this too late? Do you need to roll back?