does it has a few sparse long hairs on the carapace? no. then it isnt Nhandu. It looks to me very much like Acanthoscurria cf chacoana. Actually id say it was the form that used to be called Acanthoscurria altmanni. Get a moult and look for a stridulating organ, and compare spemathecae to those drawn in paper on the species by Bertani and de Silva 2004. Yes, superficially several Nhandu and Acanthoscurria species look the same.
This is about the only correct picture of Nhandu carapoensis i find, see the diagnostic long sparse hairs on the carapace? http://giantspiders.com/N_carapoensis.html