That was my understanding of it - I'm fairly sure there was some official stuff published to confirm that? Some people's responses were too strong or overtriggered or something so the body ends up damaging itself.
Unless that was only preliminary findings and I'm thinking of reports of reports of reports.
One of the reasons it was stated as 'linked to' not 'caused by' as it was indirect? Will need to find links to back all this up of course...
edit: BMJ seems to suggest they have now confirmed some of the specifics
https://www.bmj.com/content/373/bmj.n954
pub'd 2021-04-12
"
Two teams of researchers have published detailed observations of patients who developed thrombotic thrombocytopenia after receiving the AstraZeneca vaccine and have speculated about a possible mechanism.
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Both groups suggest that the development of serious blood clots alongside falling levels of platelets is an immune response that resembles a rare reaction to the drug heparin, called heparin induced thrombocytopenia. The researchers have labelled the syndrome vaccine induced immune thrombotic thrombocytopenia.
"
I understand what is said but don't ask me to say any of those complicated words without a crib-sheet.