Interesting that a thread where nice things are said about the Mudcat Editing Team still proudly remains on the music section.

When any other birthday thready would be quickly relegated to the BS (Shambles, emphasis mine)

You are not telling the truth as everyone can easily see by searching for threads with the word "birthday" in them.

Birthday threads about known musicians remain in the music section (Martin Carthy, Phil Ochs, Bob Dylan, to name but a few).
Birthday threads about normal (or even less normal Mudcatters, like Joe O.) are usually started with the BS tag and reamin in this section. Birthday threads for normal Mudcatters without the BS tag have (mostly) been moved down. One instance: A Shambles birthday thread.

A birthday thread about a music resource (for instance: Mudcat) belongs in the music section in my opinion.

The reasons you allude to why threads are moved or not cannot be substantiated by looking at the pattern which birthday threads are moved and which are not moved. The pattern you see, wexists only in your head.

And the any other thread is an outright lie.

Wolfgang