Kandel's obvious expertise on the functioning of the brain puts him in precisely the right position to give an assessment of how realistic Freud's models in describing what happens in the brain. More specifically, his expertise on the neurology of memory is directly connected to a lot of what Freud hypothesized about how memory functions. In fact, in his 99 paper on psychoanalysis and neuroscience
https://ajp.psychiatryonline.org/doi/full/10.1176/ajp.156.4....
Kandel cites specific neuroscientific mechanisms that connect with mechanisms in the paychoanalytic model. This is very much his area of expertise and far more relevant than Feynman shooting from the hip about something he does not really know much about. Kandel is an expert in neuroscience and from the literature very well versed in psychoanalytic work, and makes actual arguments salient to both disciplines to justify his opinions, as can be seen in the above article.
In general, a lot of work has been done in this area, particularly by Solms https://scholar.google.com/citations?user=vD4p8rQAAAAJ&hl=en...
Apropos of Tesla, this is far more than the paranoid spiritual fantasies of a genius struggling with mental illness.