For Firing and turning I follow this section in6.1 as it is covered in the other sections as well, but the basic terms and rules tell me otherwise.
And even the specifics on spooting itself refer to LOS and not to movement as under 6.1.
Und logical aspects I would follow the basics and specifics and not your quoted section on movement.
1.3 Line of Sight:
A model has LOS to another model if an unobstructed line can be
drawn between them, regardless of distance. LOS is measured
from 360' of your model, unless specifically stated othewise in
the model's special rules
6.2.7 under "Making a spot check":
"If the Spotting model can draw LOS to the Concealed model, simply roll a d20...."