Hmm det kanske finns hopp ändå, och trevligt att dom svarar på söndagar:
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When the offset is towards outside(away from the bike frame), we will use +Xmm.
When the offset is towards inside(close to the bike frame), we will use -Xmm.
According to your pictures of the crankset, the direct mount chainring looks like away from the bike frame. That should be +4mm offset.
But we don't know why SRAM prints -4mm on the chainring. May be you can ask SRAM for confirmation.
If +4mm offset is true, then we can install the chainring on the out side of the AXO-SRAM-MTB-BOOST-4-104 power meter, the offset will be +3mm, just a little bit less than +4mm.
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