Good question. Even if they bought back 2 billion shares. With mininum listing requirements meaning the shares would have to be 3 or 4 dollars a share minimum that would mean a 1 for 100 or 1 for 150 would be necessary as you couldn't have 2.2 billion at 3 for a 6 billion dollar valuation etc..
It is not the reverse split that changes numbers for us, rather it would be any capital raise. 10/15 million or less (better) 40 million up , not so good etc..
People need to know the numbers a bit to figure things out if something is announced.
Everything I post is my own opinion and people should always do their own research and due diligence on any company they are looking at