Actually, clever by FEDEX.
No, it isn't nearly good enough to make a FO or Captain move across.
But, if you are a junior FO, and no Captains bid, then the numbers might stack up. Move to HK as a captain, and when seniority is enough to hold captain back home, move back. Might speed up your command enough to be worthwhile...
Ditto for new joiners. If few or no FO's move across, and your only way in to Fedex is a HK base, then rather then risk spending next five years in a regional, take the job, and, again, move back to the states once you can.
Do Fedex hire US nationality pilots only? That might give immigration problems. Work Permits are only meant if you can't find locals, and if you refuse to take locals in the first place...