I think they are talking about the C pillar trim- the stuff on the sides of the big pillar that holds up the back of the roof. For this , remove the thick windlace seal that goes behind the rear doors. You will then see 2 or 3 tabs in the area vacated by this seal- press on these to free the edges of the trim. Further back in the middle of this panel is another clip that just pulls out- carefully. Use very little force on all these retainers because the plastic is brittle. If you do break any (as I did) you can do some creative beer-can epoxy engineering to replace these tabs.

I don't think I removed the deck on the last one I did, but you will have to remove the c pillar trim

Rick

__________________
80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??)