That’s what everyone was asking you on page one. A lot of the pushback you’re getting here is because you seem sure that “the changes” are an outrage, and must be stopped - but you haven’t been able to explain what the changes actually are. You refer us to the clickbait-y video but you’ve watched the video and you still are asking what the changes actually are.
There’s lots to debate in what’s the best way to teach history in schools, what should be included. Harder to decide what should be left out! Especially as schools only have up till Y9 to cover everything that everyone should be taught, as it’s optional from then onwards.
I agree that the report (one of the documents linked, I read a couple) highlights some poorer quality materials put together by individual teachers. I am wholly supportive of the efforts to reflect black history, Asian history, women’s history, alongside the more British males in charge centric view. Like any other materials that are put together in haste, there’s bound to be some poorer quality worksheets etc. But don’t forget that the reports, as you also noted, said that mostly, history teaching and the state of the curriculum was great and should be commended. If curriculum focus shifts, as it likely will and should through time as we keep thinking about what we should learn about, then better materials and resources will be produced to go alongside them.
I’ve had children going through school history curriculum recently - one just in first year of a levels. He was lucky that the sixth form college ran two different a level history courses so he could pick the combo he was most interested in. (And they did ancient history on top of these 2 options). What I like is that both at a level and gcse, they spend time on a range of topics both in the “broader overview” space looking at eg 150-200 years of change, and other time more in detail looking at a more focussed area over eg a 40 year interval. This means they are balancing different approaches to learning - more detailed sources, more careful examination of nuance, vs a bigger picture approach. It’s just not possible to meaningfully and interestingly cover the whole of all history, while teaching the skills needed by historians. They have to pick and choose. But one of the points that you’ve flagged, I think, that there should be an overview of British history, is already covered by the curriculum, though I’m sure there will be people who would prefer it to be done differently.
FWIW here’s the summary of KS1&2 and KS3 history (primary school through to
before gcse): https://www.gov.uk/government/publications/national-curriculum-in-england-history-programmes-of-study/national-curriculum-in-england-history-programmes-of-study
It does cover from prehistoric times to the present day. It doesn’t cover absolutely everything of course, and there will always be some historians, politicians, commentators who will say “actually they should do it like this instead” or “why don’t they all do This bit or That bit”. But remember it’s not all about facts - it’s about skills and how to develop those critical thinking and analysis skills, how to understand what we know of history, to enable people to keep growing in this area throughout their lives.