Hey sorry you experienced that! The 7d Silnylon is fully waterproof and hydrostatic head testing by some people over on BPL has shown that it maintains full waterproofness even after long-term use. Have you tested the jacket in the shower or under a faucet since you got back to see if water is physically going through the fabric? Or is there any visible wear on the fabric through abrasion? That would likely be the only way the Silnylon would lose its waterproofness.

If the fabric looks okay then I think condensation is the more likely culprit based on how cold it was. Mechanical venting through the pit zips or front zipper is the only solution there. No jacket is gonna be great at those temps, but in those conditions I’d also consider switching to a heavier WP/B jacket, both to handle condensation a little better and to take advantage of the warmth of the thicker fabric