More likely to be part silk, still very very expensive and a bit out of my league. It has a name but I can't think what at the minute. If it comes to me I'll post it.
I have a friend that has one, cost thousands and is beautiful but had terrible pile reveral in places after just a few months.
I wouldn't even think about HWE on it. At a push maybe VLM, but then after making absolutely certain of the best way via the manufacturer.
My advice then, speak to the manufacturer.