RX 6600 uses Navi 23. RX 6650 XT uses Navi 23. They're the same chip. The difference is that, back when they launched, Ethereum mining was still going crazy and all GPUs were sold out. So AMD gave the 6600 a $329 MSRP, and the 6650 XT got a $399 MSRP. As soon as Ethereum mining died, prices plummeted. Right now the 6600 is a $199 part, and the 6650 XT is a $250 part.
Given the 7600 is $270, that makes it a direct competitor to the 6650. Comparing it to a cheaper and slower GPU just to try and make it sound better doesn't actually make it better. At the same price, the 7600 is a better option than the 6650 XT. It might even be worth the extra $20 (AV1 support, DP2.1, boosted compute in a few workloads). But it's not a spectacular product, which is why we gave it 3.5 stars.
If it drops to <$250 soon, it becomes more attractive as an upgrade option for older PCs. But it's still not really an upgrade to the RX 6650 XT; it's a sideways step with pretty much imperceptibly higher performance in games.