Yep, this is it.
They are trading battery longevity for faster charging.
Personally, I generally prefer battery longevity, since that is the main factor that causes me to buy a new phone.
This is also the main reason I would like to buy a Fairphone for my next phone. I can get a new battery for $50 and replace it myself. And with 8-10 years of updates, I figure I can actually use it for 8 years with two battery replacements along the way.
Ahh, I didn't know it was already June next year.
Hopefully my current phone will last another year.