I wouldn't be surprised if they're accommodating some customers with unusual needs, but that's not a mass liquidation of their BTC.
Reading that message I'm not sure if he's actually holding BTC or if he just wants to withdraw his "Bitcoin" (TradeHIll) balance which is really USD.
In any case, my evidence is the fact that they're issuing checks to handle everyone's withdraws.
Sorry I'm still confused, you said they are handling everyone's withdrawals with checks? Not BTC? If that is the case then they are certainly liquidating BTC. Also, I'm still curious what your source is to determine which is the norm?
Thanks.