Not all planars delaminate, in fact most don't. Delaminate means the glue with which the conductive wire is secured to the Mylar that is the driver dries up and looses it's grip, the wire therefore separating from the Mylar (almost always at the end loops of the wire), causing buzzing. The only planar drivers constructed that way (conductive wire glued onto Mylar) are the magnetic-planar drivers in Magnepans (not all their drivers are m-p). No ESL's are, nor ribbons, nor the Eminent Technology magnetic-planar LFT drivers.
Magnepan cured this problem years ago by switching brands of glue; it hasn't been a problem with new models since. Older Magnepans suffering delamination can be repaired by cleaning off the old glue and regluing the wire onto the Mylar. Magnepan will do it for you, or you can do it yourself without much trouble. Removing the staples which secure the grill cloth to the speaker frame is the hardest part!