the key literary conceit of the extremely popular "stream of consciousness" style writing is that it ultimately needs to lead to a narrative -- either about the writer's frame of mind or about the particular setting they are in (from their perspective). this is the fine line between "meditations" and "rambling", and most of these essays find themselves on the wrong side. like the first essay when he finds himself on the river bank and basically does an inventory of everything he sees without commenting on any of it -- it's a purely self indulgent exercise, and doesn't rise to profundity without the addition of "meaning" or "interpretation" (ironically, these terms are mentioned multiple times in the same essay).
the relevance to "post-truth" is extremely nebulous, with vague purely lexical connections to some trumpism (e.g. an essay on swamps -- an actual swamp from his college memories, as well as the "swampiness" of memory itself -- gets connected with "drain the swamp", which doesn't even work as a mixed metaphor?)
honestly this collection would have been better served if it were a set of blog posts/journal entries rather than a book. there's a great book waiting to be written about the relevance of literature in today's world (post-truth or otherwise) but this very much isn't it. the only honest part of the entire book was the prologue where the author mentions that the intended audience are his students and colleagues -- it's extra-textual information but maybe knowing the author personally is the way to enjoy this book?
for nature writing mixed with (admittedly outdated) politics, edward hoagland's essays might be more it