Ah, the error could lie on my end because I was never good at discriminating what is sarcasm on these newfangled intertubes.
Perhaps I misread the conversation that ensued from the initial link posting...
If it has little to do with what is being discussed in this thread, it is helpful for us to understand why rather than assume we're all on the same page.
Perhaps it was the fact that I realized not too long ago I might have been fooled by certain aspects of the presentation of that matter that is what set off my pet-peeve meter in the first place, and hence I am judging the usefulness and quality of execution...
My untrained eye sees no flaws in the execution of these exercises and I'm sure one would build up strength by doing them. Even though the japanese term Aiki (the first part of aikido) can be translated as Internal Strength, I guess the video is just a commercial for selling a DVD with Daito-Ryu solo exercises. The 90 days claim seems purely commercial to me.
I know little about IS (that's why I started this thread) but from what have learned up to now, I would characterise IS exercises by deliberate, continuous, flexible, subtle and fluent whole body motion, focusing on leg strength rather than arm strength. To me, the exercises in the 90-days video don't really look like that. It looks more linear and more focused on arm strength (I could be mistaken though).