Being a huge fan of G2 since the squad was formed with their new line-up (and an unconstable fanboy of former LDLC and EnVyUs back then) I'm quite happy to see them winning an event which many top teams attended.
That being said, being a fanboy doesn't mean being blind on what are the flaws of your favorite team and G2 still have many. Winning one event doesn't make them all dissapear at once.
G2 is not the best team at the moment, they're one of the teams which get the best results against SK currently because as either Toffee or Theodin pointed it, they come against them with a special mindset, that they can't quite reproduce against other teams. However G2 is one of the team which as the best potential right now to become a solid top 1, SK still undoubtedly holding this spot. Astralis are not great right now but they still are one of the major teams.
Hopefully G2 will be able to reproduce such performances and get this top 1 they're looking for, I wish it for them but there is also a possibility that they just get back into this kind of slump they were a few weeks/months ago, and being able to see it just make you a realistic person.
Edit : Also have a lot of hopes in this NiP line-up, they still have work to do and room for improvement but the magic is back for sure and that such a refreshing feeling as the boys deserve it.