As pp say, teachers not setting work is almost entirely the fault/responsibility of the SLT and it is there you (and no doubt ofsted) should look to blame
Not Ofsted. As they pointed out, they can't inspect schools if there are no standards to inspect them against. That blame lies at the feet of the government, who were asked by Ofsted to provide standards but didn't.
schoolsweek.co.uk/criticism-of-home-learning-unhelpful-says-spielman/
"Ofsted’s chief inspector has said it is “profoundly disappointing” to see commentators trying to “polarise” the back-to-school debate by “portraying teachers in a negative light”.
Teachers’ safety concerns about returning to the classroom have prompted criticism from national newspaper columnists and some politicians.
Writing for Schools Week, Amanda Spielman said it was “very clear to me that teachers want to teach and the current situation is as professionally frustrating as it is personally concerning”.
She also said that criticism of the level of home learning provision was “unhelpful”.
Lord Adonis, a former Labour schools minister, recently called on Ofsted to name and shame schools not providing adequate online learning.
Spielman said: “Many schools have made a tremendous effort from a standing start, and they are doing what they can in the absence of clear guidelines.
“When calls have been made for Ofsted to inspect home learning, I have been very clear that there are no standards to judge against and little clarity over what schools are required to do in these extraordinary circumstances.”
She reiterated calls for the government to set “clear expectations” for schools and parents about what could be expected as “some children [will] need to be educated remotely for some time to come”."