sorce
Nonsense Rascal
You’re speculating, with no evidence.
Unless he turned the pot upside down and filled with soil through a the drainhole, there is airspace for sure.
If there isn't, the soil contains too much small particle dirt which will add to the runoff scenario, and other hydrophobic instances.
We remedy these holes with our chopsticks.
Nursery trees chock full of roots can't be chopsticked successfully if it is a true "slippot".
Sorce