I see, let me add some words.

Feminism without anti-racism means that the discrimination we see towards women won't disappear, it (The discrimination that currently affects all women) will just be shifted towards people (women) of color.

(Or the difficulties that women of color face that don't affect white women won't be addressed at all, and this the discrimination that is left over is shifted solely to black women).

As an example, feminism of the 30s and 40s was only for the promotion of white women.

Feminism today suffers these same problems. As I have said elsewhere, JK Rowling is a feminist. She is also a terf. Feminism, without the inclusion of trans rights, will result in actions that will exclude the rights of trans women. Without the knowledge that terfs are a thing terfs would 100% silently advocate for the removal of trans women's rights from the feminist movement.

The same thing happened, and is happening, to black women.

We (the royal we) like to say that feminism is for all women... But is it? Is it for women if black women's issues(which are unique to black women) are not included? Is it feminism if black women aren't included?

That's the point.