Uhmm, we have that update to 6.30.223.271 since we have 4.1 kernels in Mageia 5.
Problem could be that I suggested to use /release in the scriptlets shown above, but /updates would have brought the latest driver. But some packages are only available in /release (if there haven't been updates for them).
FWIW, I'm using the broadcom wl driver since Mageia 5 beta, and it hasn't let me down once.