Every PCB house and line within it is different ... [Rob] took a typical route, making a first stab at a footprint design supported by lots of online calculators (like these by Chemandy ...

For a PCB design tool, it’s a baffling decision ... it’s 33*0.1 = 3.3. The body of the schematic footprint is a rectangle, no fill, black outline, with a 1px stroke width.