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TPS56528: TPS56528 vs TPS54528 what is "Advanced" Eco-mode vs Eco-mode in the two chips

Part Number: TPS56528
Other Parts Discussed in Thread: TPS54528,

The two chips mentioned in the title have near identical datasheets except one of them, the TPS56528 is labeled "Advanced eco-mode" and the other is just "Eco-mode". The only difference is the TPS56528 paragraph on Eco-mode states "The off-time increases as it takes more time to discharge the output capacitor to the level of the reference voltage with smaller load current." while the TPS54528 doesn't contain the one sentence. But the statement should apply to both chips as they both state the on-time is kept the same (so obviously only off-time should be changing to compensate)....

Am I misunderstanding that one paragraph difference or is there something else?