My guess on that is that Hook may overhear GOAT discussing it and pass the info on to the Charmings. Was Henry visible in the background when Charming punched Hook? Maybe that’s after Henry’s been taken, and Hook goes to tell them about it, and Charming is all, “You knew what they were planning and didn’t tell us sooner?!
That makes sense. I like that Hook will help them out. Maybe this is where Hook finds out about Neal/Bae. They say something about how Tamara shot Neal and now they are after his son Henry. And maybe also tell him to forget about his revenge aganist Rumple since there are more important things and he’s already suffering due to Neal/Bae being gone. I don’t know. Something like that.
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"We were happy."
"Because... it was born out of true love."