The article literally tells you what to take away from it: > Until it is clear what may be causing the issue and Apple releases a fix, late 2013 and mid 2014 1

The article literally tells you what to take away from it: > Until it is clear what may be causing the issue and Apple releases a fix, late 2013 and mid 2014 13-inch MacBook Pro may wish to hold off on installing macOS Big Sur . A backup doesn’t do you much good if the machine is bricked.