> Why are there so many psychologists practicing psychoanalysis today, then?

There aren't. Psychology (in the US) abandoned Freud roughly in the 50s and 60s, with the rise of Behaviorism and later Cognitive psychology. These movements tried to make psychology an empirical science, with testable hypotheses subjected to replicable experiments. (Obviously, given the replication crisis, this effort hasn't been completely successful.) Psychiatry (the medical specialization) took much longer, until the 80s, but eventually they dispensed with his nonsense as well.

Most talk therapy today entails some form of CBT, REBT, ACT, or something similar, and these have nothing to do with Freud.