The lymph nodes are not only in better shape than those who got fatal Covid, but there were also no signs of lymph node tissue damage. In essence, the core message is that vaccine persistence in the lymph nodes is not harmful, but may aid immunity formation instead.
I've heard about the Japanese biodistribution study and have written about it (link below). First, the study injected the vaccine into the rats at about 18-35-times higher doses than what is typically used in humans. Second, only <0.1% of the vaccine is found in off-target sites, like the ovaries, heart, etc., a negligible amount (I highlighted these numbers in the link below). And no evidence of tissue toxicity was found.
So, the Japanese biodistribution findings are by no means shocking, but anti-vaccine supporters just make it seem so.