Yes - it only matters where the enemy is at the moment you take the Help action
As already clarified in your linked tweet, it doesn't matter if you move away from a target after distracting it - your allies still get advantage on the first attack against the creature - so it's obviously not the case that you need to remain standing next to the target for an ally to gain the benefit.
Further, the benefit of the Help action lasts until the start of your next turn, regardless of what the enemy does in the meantime:
If your ally attacks the target before your next turn, the first attack roll is made with advantage.
Even if the enemy takes a whole turn before your ally actually gets around to attacking it, your allies still get the benefit on their first attack. Whatever you did to distract it only stops working on your next turn, not theirs, and moving away from you doesn't obviate the effect.
The attack doesn't have to be on your ally's turn, either - it's simply the first attack any of your allies make against that enemy - so it would definitely apply if the enemy provokes an opportunity attack by trying to move away (though if it simultaneously provoked several OAs from different allies by moving, only the OA resolved first would get advantage, and the creature whose turn it is gets to choose in what order simultaneous effects are resolved).