Yup, and a bit of ingenuity needed to get started, which a few comments here have already touched on.
In the endgame you need to do a number of the other types of thing that appear in the relevant section of the 8,6 -- so although having an 8,6 to hand is not essential, having a general idea of what appears in it and what the rules of them are does help. The first type of thing was nine of the thematic objects, which you used to get the nine words. The second type of thing is indeed named as the third word of the three-word third part of the nine word instructions. Applying the fourth part will give you the next instruction, which will set you up for two of yet another type of thing! (you may want to count up how many rows and columns there are at this point...)
It's a really convoluted but clever and interesting endgame, and well worth persevering through -- it gets easier to see what's intended as you get used to the vibe! If anyone doesn't finish it now, it's one that's worth returning to on a rainy day :-) I wonder how they will publish the solution -- if they only show the last grid, that misses out so much -- I got through four copies of the grid in total.