Carbon math fights - biogenic and fossil and LUC!

I love wood, but are we subtracting biogenic GWP from fossil GWP when presenting climate impacts? Practice seems to be maturing fast, helped by EN 15804 +A2. But I’ve become a bit cynical of long-term biogenic landfill storage values making their way into the top line of our results. Am I wrong on this? Thanks in advance for your thoughts