Try these excerpts from the bit you have reproduced:
"In the less effective lessons, teachers do not always introduce lesson objectives successfully and these objectives are often couched in jargon which is difficult for pupils to understand. In particular, teachers spend too much time talking, allowing insufficient time for pupils to develop their speaking skills or teachers accept brief responses to their questions and miss opportunities to challenge pupils to think things through for themselves."
"However, not all staff make sufficient use of this information to prepare and modify work so that it presents an equal level of challenge for all pupils. As school leaders acknowledge, the most able pupils are not being fully challenged, particularly in writing."
"Marking of work is uneven in quality. On occasion, simple praise does not drive progress and work to be corrected is not always followed up."
Those bits are clearly critical. But as I said, that report found that progress overall was satisfactory.
That inspection was around 8 months since they were placed on Notice to Improve. The latest inspection, which has put the school into special measures, is one year after they were placed Notice to Improve. Most schools on Notice to Improve are either sufficiently improved to lose that status or getting close to doing so after one year.
As I have made clear previously, I am not comfortable with schools being forced to convert to academies even if they are failing.
ARK is not a commercial organisation. Its trustees are unpaid. I therefore do not see what they have to gain by undermining the neutrality of Ofsted. I think Rosebud05 is referring to Baroness Sally Morgan, who is an adviser to ARK and chair of Ofsted. She is also on the advisory committee of the Institute for Education, chairs the Future Leaders charity, has been a school governor and has worked as a secondary school teacher. Her experience as a governor and teacher was at ordinary state schools. She is a Labour peer.
The Chief Inspector, Sir Michael Wilshaw, was Director of Education for ARK but has given up that role on joining Ofsted. I personally think it would have been wise if Sally Morgan had ended her involvement with ARK on becoming chair of Ofsted in order to avoid any appearance of a conflict of interest.