Just moved into a rented duplex in Belgium. On the street facing rooms, I hear the traffic very loudly. The compression seals (the rubber gaskets between the sash and the frame) feel hard, and when I press firmly on the window, the noise drops a lot.

The landlord says the seals (original, from 2013) don't need replacing, and that I can adjust the window compression with an Allen key. I've done this on previous windows, but here the locking rollers on the sash edge are round (not eccentric) and I can't find any adjustment. Photos: https://imgur.com/a/JZHfYeI
The whole street-side facade has a lot of windows, so replacing all the seals myself would get expensive. ( around 300-550 just for the seals)

Any idea what type of window this is and how to adjust the compression, or whether replacing the seals is worth it?

Thanks!