The depth of discharge affects the amount of cycles that can be achieved without a significant capacity drop (e.g., down to 80%). Measuring with a shallow depth of discharge can artificially inflate the cycle count.
80% depth of discharge means to 20% capacity, not 80% capacity. You can see on that section that the lowest number is for 100% depth of discharge, which wouldn't make any sense if depth of discharge and capacity were the same thing.
with good rate performance till 3C and cycle lives of 300 (100% depth of discharge) to over 1,000 cycles (80% depth of discharge).
It's fair to say that between battery manufacturers cycle counts will vary. Like you said, sodium ion is a nascent technology with many new players, and improvements to battery technology could improve cycle count, but cycle measurement in absence of the DoD it was tested at makes it hard to know how durable the battery is under real-world usage.
Li-ion and LiFePo can have insane cycle counts if you never go below 80%. To illustrate here's a diagram I found on the first Google result (though from 2017, batteries were worse then)
I'm still not sure what you are trying to say. The wikipedia page compared various cycle depths. By that information sodium ion is more durable than lithium iron phosphate.
