Am I using points wrong?

[EricWVGG]

I’m trying to resize images to be presented in retina resolution. When I run the following code, the resulting image is blurry, and I need to double the desired size in order to get a sharp image.

What's going on here? If "points" doesn't mean 2x on Apple LCD displays and 3x on OLEDs, what the heck does it mean?

let calculatedSize = CGSize(width: 400, height: 400)
LazyImage(request: ImageRequest(
    url: embed.thumbnail,
    processors: [
        .resize(
            size: CGSize(
                width: calculatedSize.width, // * 2 to get sharp image
                height: calculatedSize.height // ^ same
            ),
            unit: .points,
            contentMode: .aspectFit,
            crop: true
        )
    ]
)) { state in
    if let retrievedImage = state.image {
        ZStack {
            retrievedImage
                .resizable()
                .aspectRatio(contentMode: .fit)
                .frame(
                    maxWidth: calculatedSize.width,
                    maxHeight: calculatedSize.height
                )
        }
    }
}