To be honest, I can’t find it either, it’s probably buried under mountains of posts, the closest I could find to that post is this:
You can try other search terms like (or some variation):
- Japan Reserve
- Japan Debt
- Japan Surplus
- Zero Debt
- Debt Free
- No benefit of Reserves
- Interest on reserves
- Sovereign Wealth Fund
Etc.
Hope this helps, I know it’s pretty vague.