From Padi's site for those already OW. Note the bolding of advanced and spelling out advanced.
Continue Learning | PADI
Expand Your Horizons
Your Open Water Diver certification introduced you to a new realm of exploration and made you keenly aware that you've only just scratched the surface of the underwater world. Continue your scuba journey
with ThePADI Advanced Open Water Diver course.
Experience new adventures with a PADI Instructor by your side. Fine-tune your buoyancy skills, build confidence in your navigation abilities, and try new activities like wreck diving, night diving or underwater videography.
An Advanced Open Water Diver certification also opens the door to dive sites deeper than 18m/60ft.
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A different version that still uses AOW as we are stuck with that, but does not highlight
Advanced.
I've underlined where the changes are. I think the difference in this advertising is clear.
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Expand Your Horizons
Your Open Water Diver certification introduced you to a new realm of exploration and made you keenly aware that you've only just scratched the surface of the underwater world. Continue your scuba journey
and advance further your basic OW skills with the AOW course.
Experience new adventures with a PADI Instructor by your side. Fine-tune your buoyancy skills, build confidence in your navigation abilities, and try new activities like wreck diving, night diving or underwater videography.
Advancing your skills beyond your Open Water certification also opens the door to dive sites deeper than 18m/60ft.