Just a heads-up:
TLDR: Turn off Preserve options in Remesh
I tried about 10 times and never got a result like Grant while trying to sculpt a tree trunk. I was tempted to use the tree add-on but I’m really here to learn what is being taught, not take shortcuts.
In 3.2, Remesh has options for Preserve Volume, Paint Mask, Face Sets, and Color Attributes. If all of those are ticked, the remesh works very differently and makes the sculpt tools behave oddly. In my case, it dragged the whole cube up and barely changed the topology at all.
Unticking those options made it behave exactly like Grant’s example did.