You conflate the tools, methodologies, and detailed interfaces of particular environments (that is, coding) with programming. Master programming and the warts and failings of programming languages and operating systems become less significant.
I think you first have to define mastery. Is it perfect code on every imaginable measure? I don't think so. I've been learning Windows, Linux, Networking, UI/UX, HTML, CSS, JavaScript, VB6, VB.NET, C#, ASP, PHP, MySQL, Informix, PostgreSQL, MS SQL, SSIS, SSRS, SSAS/OLAP, Photoshop, AWS, Angular, Node.js... The list goes on. The point is, someone can prove my weaknesses in all of these areas. Jack of all trades master of none doesn't mean you can't be a play maker. Failing starts by calling yourself a master.
Really? A lot of the technologies in the opening paragraph are in relation. If you are building API-centric apps, you will have to have a well rounded understanding of how the technologies relate not just the mastery of each on their own. Maybe that is the intended message?
The main issue is the overuse of the word master, which may imply the 10,000 hour rule. I suppose they do this to ward of amateurs.