High Wedge

On the fourth line  

This play is an option against Black's nirensei, which differs considerably from at a, a conventional wedge.

Playing on the fourth line makes it harder for White to make a base. On the other hand it makes it easier for White to develop central influence. This idea was developed in the shinfuseki period, and is consistent with evaluating influence constructed early in the game quite highly. Therefore it isn't surprising to find this play also in Takemiya's games.

A standard pattern  

This is one way the game might go. Since is a lighter stone than the third line wedge, White might also consider playing tenuki, after . White might think that preventing Black playing sanrensei was worthwhile.