It seems this is just a MAX route, subbed again. Every flight so far has been 7M8.
At least they're not hiding its just European C. See what I mean about Row 1 on the glorious, safe, MAX? For passengers of size that would be like wearing a corset.
You'd have to be off your rocker to pay 5000 PLN for this. The Plusgrade upgrades start at 2200 ex-WAW and 2300 back.
Loads in C are not that bad, but it could be full of staff, I've no idea:
30/09:
11/24 C, 3/6 P, 87/144 Y
03/10
9/16 C, 3/6 P, 68/156 Y
With these loads, we can't say its due to weight issues...