opportunity attack and different reach

just saw this 

How does a Reach weapon work with Opportunity Attack?

An Opportunity Attack is triggered when a creature you can see moves beyond your reach. If you want to make an Opportunity Attack with a Reach weapon, such as a Glaive or a Halberd, you can do so when a creature leaves the reach you have with that weapon. For example, if you’re wielding a Halberd, a creature that is right next to you could move 5 feet away without triggering an Opportunity Attack. If that creature tries to move an additional 5 feet—leaving your 10-foot reach—the creature then triggers an Opportunity Attack.

But crawford did state this If you have more than one reach, a foe provokes an opportunity attack when it leaves any of them. which means that even if you are carrying a halberd and they move five feet away they will trigger an unarmed opportunity attack, i never knew this before but will definately use it

Jeremy Crawford på X: "If you have more than one reach, a foe provokes an opportunity attack when it leaves any of them. #DnD https://t.co/tg4tGMDF0B" / X