89 nm? Even at 210kt that equates to just 25nm - more like 22 minutes at 250kt.
That, to me, sounds like a nice time frame in which to finish off QRH drills, go through the decision making and planning processes, brief ATC, Cabin Crew, Ops, do your performance calculations and approach briefing, complete the Descent checklist and fly the approach.
The nearest airport is not always the most suitable and dumping it back on the runway at BZR would not have been a whole lot quicker (if the preparations had been completed fully).
It sounds like a perfectly reasonable course of action to me (based upon what little information we have available here).