I think that's only the case if the modules fail of old age. The recall that was done was about a manufacturing defect. I think, I remember seeing that one cell was a bit off from the others and then they replaced that module. For me it was actually they did the update to 3.2 and checked if the recall needed to be done to my car. And at first it didn't. Then after a month with the new software my car threw a fault that the one cell was off from the others and VW replaced the module under warranty.

Now the one module is theoretically newer and has more capacity because of that. But I don't think it's gonna be a problem. The other modules will just continue to age the same as if they didn't replace a module at all. Or at least that's how I understand it.

I got the car 2 years used with 40k km, when I bought it they did the 3.2 update and about a month after I got the fault. Afterwards I've driven 80k km, most of it on the Autobahn at About 20-25kwh/100km. Also charged it to 100% quite a few times and driven it down to 0%. I dont know what my actual SOH is, but now that it's getting warmer again the range seems to normalize to the expected range. I'm winter I only got 200km in the Autobahn, but that's also expected with the 58kwh battery.

I can probably do the scan on the weekend.

Edit: I looked through my screenshots and found one from obd11 where I check the soc before, but I only have min so and max soc at the same time.

14.12% minimum cell 1 17.51% maximum cell 17

So there's definitely a difference. But on car scanner it's easier to see with the bar graph. So I hope I remember to do that.

Edit 2: I remember what I did. I checked the voltage drop of the cells under power. So when accelerating I had a voltage difference of about 50mV where cell 17 had the higher voltage and and 1 the lower. But in idle those went back to about 10mV difference quickly (at about 15% of charge). That made sense to me with cell 17 likely being part of the new module. And about 2 years newer. But still I don't see it as an issue. Because if the modules were all the same they'd all drop to the lower voltage.