I think I figured it out.
From what I can tell, to make the two blocks (one Dark-to-Light and one Light-to-Dark) you would need two, two-inch width-of-fabric strips of each of eight different fabrics, for a total of sixteen strips. You would then sew the strips together along the width-of-fabric in your desired order, making two identical sets of eight strips. You would then cut the strips across into two-inch strips. If you have 40-inch-wide fabric, you should be able to get forty strips, total, from both sets (twenty strips each). You will only need thirty.
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The finished block has one long strip in the centre, which gets progressively shorter the farther out you go. We'll call the centre strip, Row 0, since it's the starting point.
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As for the strip-pieced strips you have, we'll divide them into two piles. One that goes dark to light, we'll call them Strip A. The other fifteen will be oriented from light to dark and we'll call them Strip B. (Note that you can leave them all in one pile, I'd only separate them because it feels more organised to me, sort of like a quilting mise en place.)
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To form Row 0, you will take one Strip A and one Strip B. You will remove 0 squares from Strip A. You will remove 1 leftmost square (the lightest square) from Strip B. You will then sew Strip A to Strip B along the seam you just removed the square from so that they make one long strip that gradients from dark to light to dark again. This will be your base for the Dark-to-Light Block. The square you removed will be your base for the Light-to-Dark block. Set these aside for now.
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For Row 1, you will again take one Strip A and one Strip B. From Strip A, you will remove 1 rightmost square (the lightest). From Strip B, you will remove 2 leftmost squares (the lightest). Remember, from Strip A you will remove the right squares, from B you will remove the left squares. Along the seams you just removed squares from, you will then sew Strip A to Strip B. You will also sew the two squares from Strip B to the one square from Strip A, making sure the squares from B are always on the left side of this newly formed strip. (This is different from the longer strip you have created at this step which always has A on the left.)
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You will then sew each Row 1 to the bottom of their respective Row 0, matching up the centre squares.
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You will repeat this process for the next six rows (Row 2-7), increasing the amount of squares you remove each time.
Row 2: Remove 2 rightmost squares from Strip A. Remove 3 leftmost squares from Strip B. Sew Strip A to Strip B. Sew Removed Strip B squares to Removed Strip A squares. Sew both to bottom of respective Row 1.
Row 3: Remove 3 rightmost squares from Strip A. Remove 4 leftmost squares from Strip B. Sew as explained previously.
Row 4: Remove 4 rightmost squares from Strip A. Remove 5 leftmost squares from Strip B. Sew as explained previously.
Row 5: Remove 5 rightmost squares from Strip A. Remove 6 leftmost squares from Strip B. Sew as explained previously.
Row 6: Remove 6 rightmost squares from Strip A. Remove 7 leftmost squares from Strip B. Sew as explained previously.
Row 7: Remove 7 rightmost squares from Strip A. Remove 8 leftmost squares (all) from Strip B. Sew as explained previously.
After you have finished all seven rows, you should have two (slightly-more-than)half-blocks. Repeat the process for Rows 1-7. This will give you the remaining side of each block.