To Gandhi’s credit - acknowledging that there’s a lot he did that should be questioned - he completely changed his view on this by the 40s, in part due to his debates with Ambedkar.

His views on caste can be summarized in three phases

1915 to 1920s: Traditionalist - likely shaped in part by his upbringing in the British education system - where he saw caste as absolute and hierarchical. Not meaningfully different from the European/colonial worldview at the time, where white people were essentially “high caste” and black people were “low caste”.

1930s: Debates with Ambedkar where he tries to seperate caste from varna - ie. hold onto the idea of heriditary occupations and clans but remove the hierarchical aspect. Gets absolutely cooked by Ambedkar as u/PugJesus points out above.

1940s: Abolitionist - By 1945, he writes that the caste system has to be completely destroyed. He effectively abandons his defense of hereditary occupations, realizing it is impossible to separate from oppression.

Again, there’s a lot to question of Gandhi’s actions, but the world would be a better place if it was the norm to respond this way in the face of hipocrisy.