The context in which frankl wrote this was as a concentration camp survivor, quite different than the postmodern capitalist lends you seem to be evaluating it through
Notably, man’s search for meaning was 1946 iirc and postmodernism didn’t really ascend until some time later
When reading this question I just happened to recall a Soviet writer, who was Jewish, who I think did see the concentration camps and write about them but wasn't a victim of them.
But, this person didn't write in favor of communism despite being a writer in the Soviet Union. Their books were censored.
I found his book "Everything Flows" to be extremely interesting. It is a fictional account of a Soviet gulag survivor returning to his home, and reflecting on the people he meets and his life.
Notably, man’s search for meaning was 1946 iirc and postmodernism didn’t really ascend until some time later