Earlier quoted context omitted.
That's not obvious. Hong Kong has its own political dynamic, and is deeply divided between pro- and anti-Beijing camps.
The chief executive is basically a pawn of Beijing, where democracy is limited and many delegates who elect the CEO are appointed by pro Beijing groups. If HK got rid of their appointed delegates, the anti-Beijing group would have a clear majority.
Yes, democracy is limited in Hong Kong. The city has never been ruled democratically. The issue now is that Beijing will not take the risk of allowing separatists to take power.
As for the Chief Executive's actions, it's not entirely clear to what extent she's responding to popular pressure, business groups in Hong Kong that want stability, or the central government.