That chart is mind-bogglingly incorrect. There is no way you can tunnel 25 feet in an 8 hour work day for one individual through hard rock. That would likely even be far too fast with the use of explosives.
An example I found after a quick google search from
this site (bold added)
Progress through hard rock could be very slow and it was not uncommon for tunnels to take years if not decades to be built. Construction marks left on a Roman tunnel in Bologna shows us that the rate of advance through solid rock was 30 cm (12 inches) per day.
Even assuming high quality steel for the tools, it's not going to increase it by much. Which is the issue I have - the people that wrote these guidelines had no freakin' clue what they were talking about. So we'd just substitute 1 SWAG for another.