So can the Dems delay this procedure indefinitely just by not showing up? How would judges ever get confirmed?
No.
Senate Majority Leader can bypass the committee and bring it to the floor. Or senators can be arrested and carried to meetings (it’s happened before!).
These kinds of delays are just stunts, and give permission to the other party to pull the same stunts at some point in the future.
This is kamikaze stuff with no thought of their own future.