wt always made a difference between preaching (warning) and disciple-making work, aka bible study. Noah was not trying to make disciples. at best perhaps trying to recruit people to help him, that, with a false hope of salvation through works. That what wt does. free labor for the non-existing hope of salvation.
Noah and Jesus were wood workers, If you have ever worked manually with wood, even when not using dull bronze age handtools, all day long, day in and day out, you will do little else. (Jesus quit it to do the preaching)
The preaching is more believable than the joinery to lift elephants above everest.