LiPo and Lithium ion batteries are essentially the same thing.
Lithium Polymer vs Lithium-Ion batteries: What’s the deal?
Air travel safety authorities make no distinction between them.
It turns out that they are.
DJI suggest discharging batteries for travel in their Battery Safety Guidelines which tell you:
Travel Notice
Before carrying the Intelligent Flight Battery on an airline flight, it must first be fully discharged.
DJI got this idea from the IATA guidelines for shipping bulk quantities of lithium batteries as air freight.
IATA recommendations for cargo is the only place you find mention of SOC (state of charge.
https://www.iata.org/whatwedo/cargo/dgr/Documents/lithium-battery-update.pdf
No airline or air travel safety authority asks passengers to discharge lithium batteries before flying.
All airlines lithium battery policies are very similar as they are based on the IATA recommendations (which also make no mention of LiPo bags or discharging):
https://www.iata.org/whatwedo/cargo/dgr/Documents/passenger-lithium-battery.pdf
Poor wording and incorrect information in DJI documentation also makes flyers think they need to recalibrate their compasses before flight - another myth with no basis in fact.
No airport security checkin person has ever asked anyone about the state of charge of their drone batteries, just like they don't ask anyone about their phone, iPad, camera or laptop batteries.
Because there's no regulation anywhere requiring it.
It's just an enduring forum myth.