Those videos are very basic. However, they do make a few interesting points. And I would strongly advice a person interested in a tgm introduction to watch those videos before, or when reading List #1 in the book.
I started reading TGM a year before i started playing golf. It's actually the book that got me started playing. This might sound wierd. But, my father in law had a 6th edition lying around. And being an engineer. "Geometric Golf" sounded a real fun read! While it wasnt a fun read at the time, AT ALL, I never thought golf could be so VERY complex! (proved me wrong to say the least). I studied golf swings, watched golf on tv. Researching terms and expressions, trying to understand what it all meant. It would have been alot easier had I been playing at the time, or had some more guidance. But, my stubborness just had me keep reading, and trying to understand and analyze. And eventually, it started to make sense (with alot of help from the internets!). TGM is not a pedagogic approach to understanding the golf swing, its a catalog of alignments, not a manual. But it isnt ILLOGICAL. It is VERY logical, once you hear what Mr K has to say. ( few things in the book are outdated, for instance ball flight laws, however though, Homer Kelley did say that the face was responsible for the initial ball flight direction, and this was a LONG time ago.)
And, after a year of reading, and really getting hooked on wanting to know more, I finally started playing, a year ago, taking lessons from a non tgm-oriented pro. Once i had the basic motion down, I tried to build from there. While im visiting my pro now and again, I feel with the help of the book, it really helps me understand what im doing, and whatnot.
This year im playing from a 15 HCP, and that would not have happened so fast (or slow if you want) without the help of the book, and _hopefully_ i will continue lowering my scores. My pro, has been helping out alot. But without understanding what he tried to say, i would still have been in the dark. Im sure i will gain heaps, and heaps of more insight on the golf swing with the help of TGM. And so will you, if you just keep reading, and give it a while to sink in. I would very much like to go see a tgm-certified instructor. But, we dont have any here so i guess that will have to wait.
Thats my 5c.