Correct and agreed. This comes down to what you own already vs what to buy. I only ever really need 15Ah of stored energy. I own the 26800 dual-input I got for $30 years ago but it never leaves the house as its big and bigger than I need. I tend to leave house with say a Fusion 5000 or a 10000 or a 10000+ Slim 5000, depending on pocket/bag size.
Anker is interested in selling new stuff. I see they basically stopped selling the Powercore 20100, so this “redux” thing is about supply chain reasons. I guess LG 21700 are easier / cheaper / reliable than the Panasonic 18650 they used for… years. Your Powercore is a Li Poly they seem to now not prefer making.