Interesting question raised by a gora on the site
http://www.shasterkhajana.com/viewtopic.php?f=16&t=2213
Personally I think that the shaster from Rajhastan were not Sikh, as Singh was also used by great warriors and kings from that region
Waheguru Ji Ka Khalsa Waheguru Ji Ki Fateh
Piyari sangat ji please note the following article as written by Jathedar Sant Baba Nihal Singh Ji Harian Belan wale
Waheguru Ji Ka Khalsa Waheguru Ji Ki Fateh