You are, I believe mistaken.
IMO the problem was not disclosing known information to the women involved.
At the development stage the option was to build local inhouse screening provision or contract out. They ( "CervicalCheck" ) opted for contracts and selected some US labs, irish lab and UK(?) lab.
If an international standard had been applied the lab contracts would have had standardised protocol, process, procedures and control systems across all the lab providers.
Thats different from the international expected outcome ie. expected fail rate on correctly risk assessing marginally not-normal but not-cancer cells in standardised testing.
At least one US lab applied US standards to the Irish slides and did not flag/ refer samples which showed not-normal but not cancer cells to additional secondary screening. In the US this would not have been a such a problem as screening was around a 2 year cycle.
However in Ireland it was on a 5 year cycle.
For the women involved human error and poor controls led to test failure. The controls were the responsibility of CervicalCheck. The controls should be implemented to aim to eliminate or at least reduce human error. The early checks missed the start of the cancer and women were not called back for a retest or put on a more frequent testing pathway.
CervicalCheck was the centralised data processor for hospital data their remit includes looking at the outliers. Women tested clear and then having turned up in the cervical cancer treatment pathways.
Upon investigation CervicalCheck audit teams discovered problems with their suppliers.
A look back provided a list of women who were screened and mistested and developed cancer.
Post audit CervicalCheck opted not to inform the women directly but pushed that out to their GPs. GPs had no obligation to disclose the notification to the women (or if dead their family)
When sued CervicalCheck took the "standard" legal position that CervicalCheck would not accept liability or admit errors.
https://www.thejournal.ie/what-is-the-cervicalcheck-controversy-5358081-Feb2021/
The scandal was not that the system did not have a 100% detection rate. If that had been substantive issue in the individual cases, the general public/ women would have been concerned; accepting it as a terrible personal tragedy as mistakes happen; but on a personal level their risk of medical error was low.
The scandal was that CervicalCheck had decided not to inform the women involved of their findings of fact. And that there was a letter on a womans medical file which she may or may not have been informed of. And the non-disclosure clause in the out of court settlement was designed to protect the "Institution". The Abortion debate (since the 8th) was in full swing again so thats a womens righ to be informed and choose medical pathways.
Overall the scandal was ignoring the women at the center of the cervical screening which undermined other womens trust in the service.
And while all this was going on CervicalCheck was busy writing policy to provide for men with a cervix who had no legal right to have their cervix screened by the Irish Public Health system.
And it reflects an underlying anti-woman bias to pretend that a womens bodies are just like mens as man is the standard benchmark is a single sex female only medical field.