Stock buybacks are equivalent in purpose to dividends. Many investors prefer them because they are not taxable, unlike dividend income.
Stock buybacks manipulate the stock price. That's not an equivalent purpose. It even used to be illegal.
In the Netherlands, appreciation is immediately taxable for individuals, but not for corporations.
I presume you don't send a cheque off for €1.36 at the end of the day, (or receive a cheque back after 8 months)
Of course this state of affairs relies on companies not all jumping to stock buybacks, or else the treasury will find some new way of getting their pound of flesh