I personally wouldn’t be polite and would go for the jugular.
“We have witnessed a decline in the club that is directly attributable to one man, who had no experience in running a football club, take on the management and decision making at every level and systematically failed at every point along the way. We have witnessed an ever decreasing level in the quality of players on the pitch and the coaching and management team, the recruitment structure has gone from being jealously envied to a complete catastrophe and our development of the academy has gone backwards. The current hierarchy at the club has proven failure stamped all over it. Now being specific can you tell me, Nathan, what, Fosun intend to do to rid us of this failed structure and culture that, if left in place, will no doubt relegate us again next season, and what will you change to make us realistic promotion candidates and not repeat the previous mistakes that have turned us into iCan you be very specific in your answer?”