That’s a tool to help application developers figure out how something looks to color-blind people, so the developers can correct their presentation. It doesn’t resolve color ambiguities for color-blind people by itself.
For example, in the case of the image here, it turns everything into different shades of yellow, with both ends of the color gradient just being “dark yellow”. Now it’s clearly ambiguous to people with normal vision, as well.
That’s a tool to help application developers figure out how something looks to color-blind people, so the developers can correct their presentation. It doesn’t resolve color ambiguities for color-blind people by itself.
For example, in the case of the image here, it turns everything into different shades of yellow, with both ends of the color gradient just being “dark yellow”. Now it’s clearly ambiguous to people with normal vision, as well.