Whilst I weakly agree with this characterisation, it's not at all fair or accurate to put epidemiology and climatology in the same category as your other examples. Yes they have some weaknesses in replication practices (especially for purely computational work), yes the feedback loop for self-correction can be slow, but it would be a mistake to conclude or imply that the major results of those fields are therefore unreliable.

That's because those fields do still make objective empirical predictions about the world, which might take years to be testable but are still ultimately testable. For example, it's been convincingly shown that climate models from decades ago predicted our current climate pretty well. [0]

These fields are more comparable to subfields of physics which only get to do big experiments a handful of times, e.g. because they can only observe so many planets/supernovae/universes, or because they have to spend decades building a new billion-dollar machine to test new hypotheses.

We should also not confuse these arguments with uselessness - soft social science work can still be societally valuable without being easily empirically testable.

[0] https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/201...