this is exactly what they're trying to signal because its true. what's wrong with that? they've been extremely profitable while not spending the $45 billion they're giving back to shareholders, and they can continue to be profitable without it.
> In reality Apple could probably just become a private company by buying back most/all the public shares
no it couldn't. it's market cap is 550B. it's cash reserve is 100B.
more generally, a company cannot buy itself because the shareholders actually own the cash the company holds. generally, if a company has $X dollars of cash reserves, then the market cap on that company would be > $X.
edit: a factor of 10