The results haven't been hidden. They haven't been published in that format before and the court have ordered release of individual report forms (which will have to have personal data like name/date of birth redacted) before publication of those "tens of thousands" of pages are produced.
The UK and EMA have been open and prompt with publishing throughout. The FDA less so with national figures, because they are generally slow and seem to have trouble collating data from all their States.
The core data is public domain. To understand what it looks like you need to read something like:
https://www.gov.uk/government/publi...ary-of-yellow-card-reporting#analysis-of-data
The current report is available at:
https://www.gov.uk/government/publi...group-on-covid-19-vaccine-safety-surveillance
For context, around 23m people in the UK have received (at least) two doses of Pfizer, and around 37m have received it as a booster.
They've had around 150,000 event reports - mostly about "mild flu-like systems" or "injection arm pain" that go after a couple of days - without medical intervention.
Essentially anyone (health professional, person affected, friend etc) can fill in an adverse event report. There's no vetting at that stage to see if the information is accurate, and none at all to see if it relates to the vaccine. You can try making a report now, if you like.
https://yellowcard.mhra.gov.uk/
It will get added to next week's surveillance report without comment, it will become another data point in the report.
Some side-effects are so common that they put them in the leaflets they hand out at the vaccine sites. In fact, some are so common, that people don't bother reporting them - like the "punched in the arm" sensation that a lot of people get. Lots of reports at clinical trial stage (where you get asked specifically about such things) but now viewed as a running joke on here - certainly not hidden, or not discussed, just not worth avoiding given covid's potential to do worse.
Deaths and events that put people into hospital get analysed more closely. The fact is though - on average about 12,000 people die each week in the UK - many of them suddenly or unexpectedly, when you give 80m doses of vaccines of vaccine to more than 30m people, some of them will inevitably die of non-vaccine related causes within a couple of months of their vaccination. The analysis of whether a death is caused by (or triggered by) the vaccine takes both genuine medical expertise and a fundamental understanding of the statistics.
You can see what the experts think on the pages I've linked to. They do see "signals" in the data and when they do like with myocarditis in young men, they form part of their public briefings. They don't need to hide the data, to suggest that doctors and public health authorities the world over are hiding these things is frankly ridiculous. Billions of doses of Pfizer have now been used - there's no mass media cover-up of deaths, and there's no public health cover-up either.
As to why Campbell has tumbled down this rabbit hole at this stage - you'd have to ask him. I've been talking about adverse reactions and the underlying statistics for over a year now - because the key data had been public domain throughout.