It wasn't clear to me from the description, but the SoC is VideoSmart VS680.
Also, the A73 cores aren't much faster than the Pi4's A72, but the clock speed differential should help. eMMC will be a nice boost over SD-Card storage, but it has only 16 GB (soldered) which is barely enough for a slimmed-down OS install.
The marquee feature is probably the 6.75 TOPS NPU, which sounds good. The operative question is always what sorts of models it can accelerate, efficiently. This is typically limited by the amount of on-chip memory, which is usually rather little on a low-cost SoC like these.