"Now the key issue is why the change, and what impact that will (and perhaps was intended to) have on the conduct of the review & the conclusions reached."
From the article it seems they already have form on this:
"In the F-35 exports judicial review, Chamberlain was replaced by Steyn and Lord Justice Males. They found that Britain’s decision to allow the export of F-35 fighter jet components to Israel was lawful, despite accepting they could be used in breach of international humanitarian law in Gaza."
Noting Chamberlain was the original judge in both cases.