Because Luis is the persona, and TV their medium. 
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Here are the links to the latest episodes, from latest to oldest:
Ramona introduces Luis's Friends
180730 Helen Does Berlin (Coda)
Ramona introduces Luis's Friends
180730 Helen Does Berlin
Ramona introduces Luis's Friends
180728 Pr's Catwalk Moment
Ramona introduces Luis's Friends
180723 Ramona introduces Luis's Friends
The Unboxing of Ramona
180720 The Unboxing of Ramona pt.2
The Unboxing of Ramona
180720 The Unboxing of Ramona pt.1
You're Gonna Love Me
180716 You're gonna love me (I'm not going)
170317 I will never give up on eu
170515 I will never give up on eu (I'm not going)
Things can only get better
170315 Things Can Only Get Better (I'm not going)
Luis revisits his musical education
180710 Luis revisits his musical education