Author here. Sadly this is true. I don't sell modchips anymore because it wasn't very economical or profitable.

I did come up with ways to assemble the chips faster but I couldn't optimize it enough so that I could remove myself from the equation. I ended up selling enough to get rid of all of the inventory I purchased and making enough profit to cover any tool/equipment purchases.

If anyone knows how I could streamline the whole modchip creation process I would be very interested!