The Delta Skyclub (already accessible with Amex Plat) is great for Delta passengers. Not sure how this adds much benefit.
However I see that Lucky mentions:
However, keep in mind that those with Amex Platinum Cards get access to Delta SkyClubs when flying Delta same day, so I imagine many people using this terminal with an Amex Platinum Card already have lounge access.
When accessing SkyClubs with the card you can’t take guests for free though, while eligible Centurion Lounge guests can bring in two guests for free.Good thing all my kids have their own Plat cards.