Because there are less players actually confirmed out? It could have been those 4 + Alisson, Firmino, Henderson, Wijnaldum, Robertson, Fabinho, Thiago.
As it stands, it's just those 4.
Alisson & Firmino clearly fine after their team-mate tested positive.
Henderson - still TBC but no reports of it being serious, he was only taken off as precaution.
Wijnaldum - picked up a knock but played in Netherlands' next game.
Robertson - is this confirmed he's out? Not seen anything.
Fabinho & Thiago - both reportedly will be fine.
So yeah - huge panic in the start as you could have had a remarkably depleted & different side in place.
Now it's less panic (or should be?) because it's only 4 players. Not downplaying the standard of those 4, but my point is it could have been so much worse...