Not a specialist at all: I relocated to Japan, and have only worked about one year in France... But you are missing a (big) piece of the French pension scheme: the Agirc-Arrco system, which is mandatory and complement the base system your link is referring to.

Someone at 60k€ should expect a total retirement of roughly 3,200€/month (back of the envelope calculation). Someone making 150k€ would expect a retirement of about 7,000€/month (again, back of the envelope calculation). Making 300k€, you would expect close to 14k€/month (again, back of the envelope calculation). I think that's pretty much the maximum you can get, it doesn't scale much further than that.

Off-topic: any reasons related to the current topic that you relocated to Japan?

Absolutely none whatsoever.

Financial concerns didn’t weight at all on my mind when deciding to move here, so I can’t tell you if it’s better or worse.

I strongly doubt it’s better, especially for retirement, but I could be wrong.

So I’m not even sure why I’m arguing about cross border salaries or retirement benefits…

The Agirc-Arrco is a separate, compulsory system that has separate contributions to the state pension.

Of course, who knows how long Social Security is actually going to last, given the repeated Republican tactic of squeezing money from its line items to give to tax cuts instead.

Macron is pushing for similar things in France.