You are completely ignoring tennis history. Pro Slams are indeed Majors. Majors always received the category of Majors back then, and still are. Laver is more popular than Rosewall and all the players from the past for the Grand Slam (winning 4 Slams the same calendar year) a feat only he has done (and twice) in tennis history. And Rosewall was more succesful than Emerson in the 1960s, as he won 14 Majors in the decade. Even if you prefer Emerson's resume in the 1960s, you can't omite citting Rosewall.
If Pro Slams are not Majors, then why is it said in Ken Rosewall's Wikipedia page said that Rosewall won 23 Majors?
en.wikipedia.org
Rod Laver is also acknowledged as having won 19 Majors (11 Grand Slams + 8 Pro Slams) by Wikipedia:
en.wikipedia.org