He's always been against high interest rates but his perspective is more personal than him having a great grasp of international or domestic finance issues, at least thats my opinion.
The problem with a weak lira is that while it does make Turkish exports more attractive, it hits the man in the street far more than it does those in their gilded palaces. Higher rents, increased prices for imported goods, reduced ability to travel outside Turkey etc. A lot of business in Turkey is done with hard currencies such as the dollar and the euro, no-one wants to use the lira due to its volatility. Yes, Turkey does need to reduce its trade deficit but there are many other ways to do it - allowing the lira to tank is a poor choice, if indeed it is a "choice".
JF