We're not calling it that anymore. It's been rebranded to "SuperDuper Speed USB ]|[" now. Note that this is a different standard than the previous "SuperDuper Speed USB 3," and under no circumstances should you call it "SuperDuper Speed USB 3.0," because there was never any such spec and pedantic nerds will climb up your nose in the comments if you ever utter it.
Sort of? It borrows a lot of the high speed protocol bits from Thunderbolt 3, but I think it does DP a little differently (at least it supports different DP standards than TB3). So it's closely related, but not necessarily the same thing.