It means its getting harder, its a good sign.. Later the whole trunk will be like that.
Here is an example.. all those white specks eventually get closer to eachother and ends up like that.
sry about bad quality pic, but im sure u get the idea.
https://www.rollitup.org/outdoor-growing/24703-its-all-bullsh-t.html
^ This one is very informative.
https://www.rollitup.org/outdoor-growing/45900-fdds-starting-early-outdoor-08-a.html
^ This is one is his latest.
Hmm, good curing and drying takes awhile.. maybe he meant from start to finish: seedling, veg, flower, dry, and cure?
Wouldn't that take about 9 months?