I always found this a bit short-sighted. Certain positions on the table tend to have certain "points ranges". Huge outliers, like our 3rd place finish with 66 points last season, are incredibly rare. Therefore, points totals are a reasonably good indicator of a team's overall level. A team that finishes third with 66 points needs absolutely massive improvement to become a title contender. A team finishing third with 85 points is quite close already. So no, league position certainly isn't everything. And while comparing points totals across very different eras is indeed meaningless, 2015/16 really wasn't that long ago. Football and the Premier League hasn't changed drastically since then.
Also, there's only so much you can do to influence the performance of other teams and league position is very much dependent on that. Thankfully, this past couple of seasons most rivals have been even worse than we are (and we're also quite clinical and have a handy habit of overperforming our xG). But in terms of points, performances, quality of football, we're still just a top 4 contender, nowhere near a title challenge. Nothing has really changed since the days of Moyes.