Prediction: that won't be a precondition in the USA, and if it was, most companies would decline the aid. You see, buybacks are "that one weird trick" where you can steal from the market, by inflating the EPS and hence your employee stock options, and not go to jail.
It's not "stealing" from the market. All it does is increase the value of each share in proportion.
In a way it's similar to dividends, but not taxes in the same way.
Basically the logic behind the French government reasoning is "we're giving you money to support your business and your employees, not to give it away to shareholders".
Note that this wasn't the initial plan of the French governement, initially the plan was to pose no conditions, just saying "please be responsible in your choice". It's after the public backlash that they finally put conditions.