The link doesn’t open, says connection refused 🤷.
Regardless, if it doesn’t require the bias pin, the mic is self-biased or biased through another source (use the same wire for the signal to get bias, this is easy, you just use a cap to decouple the signal from the bias).
Yeah, those kinda puzzled me as well. They didn’t look like they’re varnished, but I suspect I could be wrong about that. After all, they do work, lol 😂.