This is definitely not an officially approved study result . . . so, it’s gone. From Will Jones at dailyskeptic.org:

A Lancet review of 325 autopsies after Covid vaccination found that 74% of the deaths were caused by the vaccine – but the study was removed within 24 hours.
The paper, a pre-print that was awaiting peer-review, is written by leading cardiologist Dr. Peter McCullough, Yale epidemiologist Dr. Harvey Risch and their colleagues at the Wellness Company and was published online on Wednesday on the pre-print site of the prestigious medical journal.
However, less than 24 hours later, the study was removed and a note appeared stating: “This preprint has been removed by Preprints with the Lancet because the study’s conclusions are not supported by the study methodology.” While the study had not undergone any part of the peer-review process, the note implies it fell foul of “screening criteria”.
The original study abstract can be found in the Internet Archive. It reads (with my emphasis added):
Background: The rapid development and widespread deployment of COVID-19 vaccines, combined with a high number of adverse event reports, have led to concerns over possible mechanisms of injury including systemic lipid nanoparticle (LNP) and mRNA distribution, spike protein-associated tissue damage, thrombogenicity, immune system dysfunction and carcinogenicity. The aim of this systematic review is to investigate possible causal links between COVID-19 vaccine administration and death using autopsies and post-mortem analysis.