"Wasn't the 4th originally a Biarritz left somewhat in tact by Rees Jones?"
Michael H -
While I have never played an authentic/classic Biarritz (Yale, Fox Hollow, etc.), I did play the Dunes in late March, shortly before the course was closed for the current renovation.
I would say any relation between the 4th hole as it last was and an authentic/classic Biarritz was marginal at best.
DT