Such transfer actually made perfect sense until recently because they didn't allow to change username. It was brought up on their forums numerous times[1][2] over the years and they only introduced editable profile name in March this year. Until then they advised to create a new account and ask their support by email(sic!) to have your playlists copied.

[1] - https://community.spotify.com/t5/Accounts/How-can-i-change-m...

[2] - https://community.spotify.com/t5/Accounts/I-simply-want-to-c...

Isn't that the same site linked by this very post?