OK, I read the article and I'm gonna give my thoughts on it.
First of all, they are not calling Tiger a superstar, they are simply saying that this movie gives him that potential, and I agree on that front. He can be a superstar in a few years by focusing on Baaghi 3, Rambo, and the YRF movie. But people on this forum are overestimating him IMO. They are all like one more blockbuster coming with SOTY2, 20cr opening coming. I do not see that movie being that big. The brand value is not as big, the director gave a big flop in 2013 and has been inactive since then. Do not put him to a standard he cannot match. I think it's opening on a holiday, in that case a 15-17cr opening can happen. Further predictions upon trailer/songs.
And yes, the YRF movie will be sold on both Tiger and HR. If something changes like S30 flopping or SOTY2 breaking out huge, then it will be sold on Tiger more.
Speaking about the rest of the article. I am happy to see that SRK is the only superstar with a romantic image in the last several decades. It seems like even ALR is taking him to that sort of zone again, depends on the treatment and the rest of the movie.
As sad as it is to say, HR's time may have really passed. He can still be a big star but right now he hasn't taken a 10cr+ opening since 2014 and many movies are targeting S30's date. On the other hand, his choices indicate that he wants to have both content and commercial movies not that level of stardom. Just wish when he does commercial movies, he picks better directors than Siddarth Aanand.
Yes, Salman was big in the 90's but never had a proper image. Then in 2000's he survived due to PR and his close friendships with Sajid Nadiadwala and David Dhawan, among others. He found his calling with Wanted and hasn't looked back since.
Ranbir will probably have a big hit with Sanju, but it is upto Brahmastra and the upcoming YRF movie (directed by Karan Malhotra, starring Vaani and Sanjay Dutt) to really revive him.