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I know very little about Japan or Tokyo.
But watching the public transport animation on https://minitokyo3d.com/ is amazing.
They also have links to life railcams.
Two of my favorite ones are:
https://www.youtube.com/watch?v=glw8cHPywtE exactly like the article describes, lots of bikes and some small cars. (It has several hours of buffer so you can scroll back if you happen to visit during Japanese night)
https://www.youtube.com/watch?v=tet7qKMUncA this is the impatient train spotter's paradise. It never takes more than minute until the next train comes. As a bonus for hackers there is automatic detection of the rolling stock type. Not sure whether the code is open source, did not see a github link. (This camera is not 24 hours, so you need to visit during Japanese daytime.)