This is a tricky question. Yes and No. Regular taxis are not allowed inside the airport (those from the City), if you want to take one of these taxis, you need to go out of the airport, and by this I mean really outside the Los Cabos Airport.
The other taxis at the airport, are actually private transportation companies allowed by the airport to have a desk there but prices will be really high.
That’s why most people reserve their Los Cabos Airport Transportation prior to arrival.