The WoR Ars Arcanum describes Lightweaving as- A (second) form of Surgebinding involves the manipulation of light and sound in illusory tactics common throughout the cosmere.
I think the key word here is 'illusory'. So even if Truthwatchers can manipulate light and sound but don't make illusions, it should not be referred as Lightweaving. And if we see Renarin making illusions, we can say he is Lightweaving. What I understand is that terms like Lightweaving and Windrunning describe the act of using the Surges, that is the process of surgebinding. When a Windrunner surgebinds using the Basic lashing( noun form), he is said to be windrunning. Windrunning also aptly describes fly through the wind, which is probably why the term was coined. (Windrunning is also mentioned in the WoR Arcanum. So we are correct in using the verb form) This I think is true for all the Radiants.(I am trying to think what Skybreaking implies.) Once we see Skybreakers in action it will be confirmed if their flying through the sky is called Wind running or Skybreaking. Perhaps Skybreaking will describe the simultaneous use of Lashings and the Division surge(breaking). We also have a WoB both orders use the Lashings in the same way so an observer won't know if it is a Windrunner or Skybreaker who is flying so a Skybreaker may as well be referred to as windrunning.
As regards to the point Crystin Radiant is making, I think what he is trying to say is that for different artistic abilities, the Cryptics can manifest differently. Shallan, for example, is expert in drawing and she literally drew Pattern into the Physical world. For a singer or a sculptor, the cryptic may manifest differently. Perhaps the singer will sing a specific pattern of notes, or a sculptor might carve out his Cryptic, a mathematician might develop a new formula (all cryptics have a pattern, it can be a pattern of anything, a pattern of notes, a rational number, etc). I think the possibilities are mind boggling.