For normal advertisement you are correct but Nintendo isn't normal. They will release a direct video and get fuck tons of views.
Look at there youtube video for the reveal. 18million views since release. Nintendo needs to keep this ball rolling or it will be a repeat of the Wii-U in marketing.
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The major difference between the Nintendo Switch and Playstation 4. Is that the Ps4 was seen as the gamers console and now some bullshit Microsoft was doing. Sony was rolling on hype and dog Microsoft every step of the way.
Nintendo needs to keep pushing because they are coming off the massive failer of the Wii-U.
But hey maybe I am wrong and this will work. I hope whatever Nintendo decides to do does work, But I don't see them marketing a system for 2 months as being enough to hype it. Even more so when they mainly just do youtube videos and that's it.