I was wondering about that myself... It also gave me the willies when he was using the table saw cutting those tiny little strips with his fingers so close to the blade!
It’s not a blade, it’s a sanding disk (at least the one seen in the first few minutes of the video).
ah, that's a relief!
Realistically, given the tiny size of that table saw and the small parts needed to cut, what other way would there be to use it?
He could have used another piece of pvc instead of his finger
We never see his face so I'm not sure where your assumptions are coming from, but I'm sure someone with enough PVC experience to make a working model excavator out of PVC is probably taking the necessary safety precautions..