The 49ers are not nearly the same team without Trent Williams or Deebo Samuel, both of whom were inactive Week 7. Additionally, Brock Purdy was concussed in the fourth quarter, which had to be at least a contributing factor to his boneheaded interceptions. The level of red zone ineptitude exhibited by the Vikings in that game (1st & Goal inside the 5-yard line twice and settling for field goals both times) is not sustainable and would be exploited in the postseason.
We can point at certain gaffes and miscues and say, "If we didn't ____, we would have won," but there comes a point where they are not an aberration rather a damning flaw. Teams don't win Super Bowls making mistakes like those the Vikings have made this season, and they've been making them consistently throughout the season.