Materialist theory holds that man is the product of environment and education, so the changed man is the product of another environment and changed education.

This theory forgets that the environment is changed by people, and educators themselves must be educated.

1, the reference in the question is involved in Marx's Outline on Feuerbach. Marx also cited examples, such as Robert and Owen, so it is not difficult to know that the materialism criticized by Marx was only French materialism at that time, or mechanical materialism.

2. The reasonable starting point of the so-called epistemology should be its own logical premise, and the external is other viewpoints it criticizes. The logical premise of mechanical materialism is: the world is material, and material runs according to mechanical patterns or laws. To understand this starting point, we must understand the object it has to overcome, that is, Descartes' dualism of mind and matter. French materialism, which developed on the basis of overcoming Descartes' dualism. Descartes' philosophy divides two kinds of entities: thinking spiritual entity and mechanical material entity. But in this way, how to think realistically and how matter can be thought becomes a problem. Therefore, French materialists abandoned Descartes' spiritual entity and thought it was unnecessary. There can only be one real entity, which is a mechanical material entity.

3. According to this view of mechanical matter, the world operates according to the laws of mechanical matter, and thinking is the product of matter and is determined by matter. In other words, knowledge is determined by matter. Then, as far as people are concerned, things are not only human nature, but also human environment. The so-called education, that is, thinking, is also fundamentally determined by matter.

The above is the answer to your question.