That's a good link, I did check that out, but there's no guarantee that's what the AliExpress board is using. There are no values on any of the filter components since they are small SMDs. The circuit is broadly similar since it's the same chipset. In any case, I had a good match once I modified the input, for at least the lower part of broadcast VHF (and that's what the chip is designed for; broadcast bands), which was the region I was interested in. Unfortunately I didn't write notes at the time, but I believe the 85m-when-powered.png file is with the filter removed, looking into the front-end chip (but not 100% sure since I didn't keep notes).
Plus, it's a lot of effort to measure and modify a single input, let alone all six. So if the other inputs are just as bad, it would be a nightmare to fix the entire SDR.
So, I'm fairly convinced something's not right with the hardware (bad design, and/or fault), but you can imagine just to get that far, took a fair amount of effort. I'm not sure it's worth putting more effort into it, so I gave up. But one day if I'm feeling adventurous, I'm going to isolate the input to the second chip (requires cutting traces), and use it as just an IF processor (i.e. feed my own I/Q signals into it). More fun doing that I think, than try to repair all six inputs (and even then, not being sure if there is another issue causing the deafness, e.g. poor supply rails).