Yea lots of examples at my dealer (who's got the team and work with ktm austria for racing)
It's absolutely not the exhaust that cause valve float (and I think the logic can told so too, but why not) but the cam chain tensioner, and they know it yes.
And yes it happen on 09/10R too and track models.
And yes again they have some cases started in 2009 when racing or on tracks.
And some cases with stock exhaust too.
Very rare on roads, but not uncommon on tracks in certain conditions.
To avoid this ktm told them to put w60 oil and to mod the cam chain tensioners or put the manual ones they gave them ;-)
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