Yes that maybe true, but it may get the silver bark later.It doesntr really mater if it does or not.(I have another silver birch that i am growing in the broom style which i would like silver bark on.)
Basically i just wanted an easy growing tree that has smallish leaves suitable for mame, and this one seemed to fit the bill.
The style is more or less as it is at the moment(not sure what you'd call it)
Kinda like one of these.:
http://www.mini-bonsai.com/hyousie/annex/15_Gazou.jpg
From
http://mini-bonsai.com/indexe.html