When you say "barely", it sounds ridiculous. Nobody cares about how close a series was, as long the team got the win.
Additionally, Gambit beat VP and G2 in bo1s, and they beat Astralis in a bo3. Pre-Major rankings had VP at #15, G2 at #4 and Astralis at #3.
NiP defeated SK at #1 in a bo3 and FaZe at #2 in a bo5. They also beat world number #3 and #7 in the group stage in bo1s. Now a Major is supposed to have greater weighting than a tier 1, $250k event so you do have a point, but NiP's map and series wins were infinitely more impressive than Gambit's.