This step is non-negotiable and cannot be skipped. Freezing the tofu changes the texture, making it much drier, firmer and chewier. And it must be frozen for at least 2 days. If you don't freeze the tofu first the texture of this roast isn't anywhere near as good. Don't think you can skip the freezing and just press it longer. That will not replicate the same texture. it absolutely has to be frozen.