There are a BUNCH of unique spells in that grimoire that aren't in your screenshot, but it glitches out if you inscribe them and then reload a save. Also it somehow has Shadowflame inscribed as a level 3 spell when it is a level 4 spell. My advice is to save before travelling there (you have to have seen the ghost in Russetwood about the apprentice hiding the grimoire), pick it up, quickly have Aloth/another wizard learn every spell, copy them into a second grimoire, and then save to a seperate file. Then you can test loading that second save to make sure the spells don't magically disappear. Some of those spells are extremely strong.