[Case0823]

I had a similar thought on this strategy initially.

I also found that I had misinterpreted the field drawing as to whose secret passage is whose, due to the different flags in different drawings being visible. That topic is covered in another thread.

The point is that the secret passage you'd need to sit in or by, is controlled by the other alliance. Therefore if you are contacted by their bot when they try to receive boulders you will most likely be penalized. It also means that the other alliance controls when and how those boulders are put back onto the field. This will limit your points. AA year proved how a nicely timed bump can cause a miss with a long shot. Therefore I do not think this will be a high scoring strategy for very long if at all.
It worked better for Frisbees since you controlled most of the variables.

It's technically feasible with the current rules but very risky. This also depends on the interpretation of the blockade foul.