Thrace's is 12 words. Edmonton's is 8. Fenton's is also 11, ignoring the extraneous restriction of needing to target an enemy model(a restriction that's built into the core rules), and the "or" between action types.
Calling Thrace's wording "much shorter" is just wrong. As for why they're all worded differently, this wouldn't be the first time Wyrd has multiple effects worded differently that all work the same. Just look back at Fenton's morale action that has a restriction that's already in the core rules.