Twitter has been taken private so this is not corporate raid.
Corporate raid is aimed at making changes to the company specifically to increase share price. The idea is that the resulting share price increase covers at least significant part of the cost of getting majority stake. This makes the buyout relatively cheap or even free.
Which of course makes little sense if you are also taking the company private.
I would also like to point out that the whole point of buying a controlling stake in the company usually is to exert some control. And to buy it out completely and take it private is to exert complete control without having to explain yourself (too much).
There is, of course, possibility of the investor buying shares because they are content with current management and do not plan to interfere even after they have acquired majority stake. But this, in my experience, is quite rare.