Ofsted reports are based on a few days in a school where everyone is on their best behaviour.
Paperwork is used as the evidence base for most areas of judgement.
I've been a teacher for fifteen years. Every school I've worked in has had toxic management teams full of incompetent bullies who made the lives of the teaching staff hell. And yet all of these schools had Outstanding Ofsteds with a couple of the headteachers - both horrendous bullies - described as 'visionary' and 'exemplary' etc.
Of course there is the opportunity for staff to 'have their say' during an inspection, and there is a promise from Ofsted that what they say will be 'anonymous' but most of us who have served under a bullying management team will know and understand the fear of speaking up and the consequences if anyone does. The Head will find out who spoke out and they will be punished. So no one says anything. In one of the schools I worked in, the box for teacher feedback (it was handwritten back then) was placed in the office of the Head's PA. Some of my colleagues and I were brave enough to call the Head a bully and to describe the toxic work environment. We were shocked when the Ofsted report made no mention of this. Until we spoke to the Head's PA, who told us that she had been instructed to shred all of the forms on receipt. Ofsted never saw any of them. And they weren't interested in why none of the staff had apparently filled in any feedback forms.
Ofsted don't look at things like staff retention and turnover. They aren't interested in what schools are like as employers. That is the biggest flaw of the system. No school will be able to provide a truly 'outstanding' education (whatever that means) if their teaching staff are exhausted, overworked, bullied and unsupported. It used to amaze me that Ofsted don't seem to have any interest in staff wellbeing and how easily they are hoodwinked by useless SLT teams - but then I remembered the types of people who become Ofsted inspectors, and it all made sense.
In short, I always encourage parents to pay no heed to an Ofsted inspection report. In fact, the worse it is, probably the better the school, to be honest.