From the comments noted (bold by me):why does your 3rd paper say (in bold orange at top of page)? did you click that to read the comment?
www.mdpi.com/1467-3045/44/4/113/htmAldén et al. (2022) recently reported the intracellular reverse transcription of Pfizer BioNTech COVID-19 mRNA Vaccine BNT162b2 in vitro in a human liver cell line (Huh7)  that has raised significant concerns over the consequential genotoxicity among mRNA-vaccinated subjects.
The novel COVID-19 vaccines have been subject to several controversies since the beginning, and concerns over their potential to be incorporated into the human genome or alter human DNA (genotoxicity) have been a major public concern, also exploited by anti-vaccine campaigners, and have significantly affected vaccine uptake and corroborated to vaccine hesitancy globally. This article explains reasons as to why such a phenomenon, demonstrated recently in vitro, may not manifest clinically in vivo and therefore cannot be generalised to the healthy population.
First, although Huh7 responds to INF stimulation and is a promising cell line for studying viral infection and replication in vitro , it does not reflect an in vivo environment, particularly the absence of comprehensive cellular and humoral immune response. The experimental model employed by Aldén et al.  is scientifically incompetent to evaluate the genotoxicity of mRNA therapeutics, including BNT162b2 COVID-19 vaccines. The vaccine distribution beyond the injection site and consequent transfection to hepatocytes, albeit a possibility [3,4], will result in the translation of the mRNA into spike proteins that will attract an immune response towards vaccine-transfected hepatocytes. In the majority of cases, a healthy immune response, mediated by cytotoxic T cells and anti-spike antibodies, will eventually clear off vaccine-transfected hepatocytes; therefore, the reverse transcription of mRNA may not be a reality in vivo.
So at least this guy disagrees. My younger son is a grad student in phama-chem and speaks often of compounds that are successfully tested in "lab livers", only to have it not work in rats. I'll see if I can get him to look at this this eveing.