I understand what you said in your post but just a point in the bold part (I did not quote everything).but their 2023 didn't see a surge in unit sales that I would've expected,
1400k is basically historic record breaking sales for a PlayStation console in a year in France.
It is 300k more than any other year for PlayStation.
It is only behind Wii that reached 1600k in a year.
So I don't see it being less than expected... in fact the surge after the supply issues is big enough to catch PS4 in like 2-3 years.
Of course that taking that 2024 will follow the same trend.
The data just shows how bad PS5 was affected by supply in Europe (way more than US and Japan... Sony probably prioritized these markets when shipping).
If it had no supply and could maintain constant around 1000k per year it probably should be ahead PS4 now but due supply it did 500k and 300k... 800k in 2 years is really too low.