> Reading the article one finds that they only created very small cathodes rather than anything close to a 'consumer sized' battery

There are few articles on 'consumer sized' 18650 sodium-ion (Na-S, Na-ion) battery (aka NIB):

October 2019: Developing O3 type layered oxide cathode and its application in 18650 commercial type Na-ion batteries[0]

May 2022: First 18650-format Na-ion cells aging investigation: A degradation mechanism study[1]

August 2022: Remaining useful life prediction for 18650 sodium-ion batteries based on incremental capacity analysis[2]

[0] https://www.researchgate.net/publication/336562138_Developin...

[1] https://www.researchgate.net/publication/359078973_First_186...

[2] https://www.researchgate.net/publication/362754837_Remaining...