Possibly, but I don't think there was much of a risk. Boeing already had--presumably--at least a pretty decent idea about the review's contents by piecing together hints from document requests and questions or maybe even someone calling in a favor to get a draft copy. The Joint Authorities Technical Review (JATR) involved a lot of agencies and personnel from multiple countries.
On the other hand, that also poses a problem for any attempt to change the report. There are a lot of iterative copies out there, with both Reuters[0] and the Times obtaining copies independently. Pressuring the JATR team to change its findings would leave an absolute ton of fingerprints, and be instantly obvious once reporters start reviewing a diff of the report.
On the other hand, if the final report released today is much more benign that what is reported here, wouldn't it make the suspicion of conflict of interests a lot worse ?
Couldn't the publicity conjure a lot of lobbying/political pressure to change the report?