I don’t think he did that bad of a job with the video, and had the original, unadulterated Tech worked, then he may have a huge success on his hands.
The reality is, dianetics did not deliver what it promises, despite LHR regularly stating that this or that did work on everyone he tried it on people when researching for his book.
When people began to see through the lies that LHR gave them, and the subsequent ones they told themselves, LHR squirreled his tech and came up with a reason why it did not work – another step on the bridge to allow people to lie to themselves a little longer. He continued to do this all throughout his life.
After he died, DM did the same with his golden age of tech, new releases, ideal orgs, etc. People who were loosing faith got excited again and allowed themselves to be pulled along (although less successfully than when LHR did it).
Now Marty is doing the same as DM, showing a fault and promising it will make a difference. Many, many people want to believe and will see this as another great step, removing impediments to their success that "DM put there". They will be excited and grasp this opportunity with both hands.
Unfortunately for Marty, he has painted himself into a corner. ,Once people realise that the unadulterated tech does not work, as they began to realise when LHR was alive, Marty will have no were to go without becoming the priest between the word of LHR and independent scientologists.
And then this video will rise to haunt him.