Ok. Going to make a quick translation of that vid (the customization segment).
1 - This is the same racquet Nadal uses. We will go through the same process we'd to personalize a racquet for him. ("if he requested us to..." I could add that based on my interpretation of his words).
The text displayed on the video says: "The weight balance depends on the personal desire by each tennis player"
2nd segment: He says more obvious stuff, tell people he's holding lead tape. Then he measures that tape to check how much it weighs.
Text: The details of racquet customization are almost never disclosed.
3rd segment: He explain to the audience why tennis players don't disclose the details of the customizations. He uses an example of race drivers (Formula 1). Race drivers wont tell the configuration of their cars, same as tennis players wont tell the specifications of their racquets.
Then he says some more obvious stuff (for us, TW posters);
Text: Every tennis player got his own personal stringer (lol).
4th segment: He talks about the strings. Says nowadays the synthetic stringers are more popular amongst players. Then he explains why Nadal keep changing racquets every time new balls are added to the game. (He says every seven games). We all know why...
He also says that altitude is a factor into choosing the strings tension. (more obvious stuff).
He finishes saying it's the same model of Nadal's racquet with a SIMILAR personalization, so yeh, he doesn't saying he's exactly replicating nadal's configuration.
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So yeh, it was a segment to inform people that don't know much about tennis about racquet personalization. Wont tell us anything we don't know, tho.