With this 0.5% income limit, indeed, it wouldn't even be close to a 60 millions deduction from his taxes, but I heard that Pinault was still going to get a 60 millions tax deduction
So I went to check, and actually, this 0.5% limit only concerns companies
For a donation from someone, there is no specific limit. It's a tax deduction like you said, so you're kind of limited by the amount of taxes which you pay
If you pay 20K euros every year, then you can get a deduction up to your 20K euros. And actually, you can even get to a 100K deduction, because the deduction you get is acumulated on a balance, and it's valid 5 years after you receive it.
So when you give 100 millions, you get a 60 millions tax deduction, which you can split on your taxes of the 5 following years
And this Pinault guy probably pays at least 60 millions euros of tax every 5 years
I didn't look for any proof or anything, but rich people pay very expensive tax in France, and that's why they all hide their money in Switzerland, so I wouldn't be surpsised if the richest billionair in France paid more than 12 millions euros per year