If you come in the south entrance to tube, can you get to the blue hole to swim?

I would recommend going to north entrance first checking out blue hole, then driving to south entrace, will not need to pay again. Then they will shuttle you to north entrance and you can tube down to south entrance and go straight to your car.

The Blue Hole can be accessed from the south entrance only by tram or driving over to the north entrance. There are no foot paths nor can you go upstream to get to it.

I just went Saturday the 13th. And you go to North side to get to to get to blue hole and also the 2.5 hour tubing. The South side is the shorter tube ride.

No...Blue Hole is only accessible from North entrance

Yes