This can give a false sense of what Google (Alphabet) actually knows about you. That above is Google playing the game of 'ok, here is what we know of your activities on youtube when logged in!'
But Google and the rest of the "advertising" (euphemism for surveillance) industry track and create "profiles" based on a basket of data points, from ip/MAC address to the rest of their bag of tricks.
Internally at Google a toy tool to peek into your own personal advertisement profile was released and taken down within a week or two because it was creepy knowledgeable about you.
