For years I had three or four Honduras mahogany tomato stakes. They lasted better than any other wood I had at the time. Eventually they were used for moulding on a job. Granted, ground contact was a limited time situation, but other woods would deteriorate at the point.
Water expands when it freezes, a given. Freezing water in wood cells expands and pulps the cell walls. That's a mechanical deterioration rather than organic. Like some other wood types, Honduran mahogany doesn't soak up and hold water as much as some other woods.