Yes, very productive thread. No info on what happened to Allodial but my guess is ... his/her objective was reached here; mission accomplished. And then told to stand down or, left on their own.
We are consistently winning versus the IRS with lawful money remedy. I have seen them occasionally threaten a lawful money tax return with a frivolous penalty. Probably these letters have worked so well for the IRS in the past they continue to send them. Here is a recent example:
Here the IRS tries to create an illusion, saying the tax return claims a frivolous position when in fact it does not. Bit of a psychological operation at play. Gamesmanship. Responding with the law will cause the IRS to back down, eventually. And the threats melt away like January snow.