yeah - there is a certified data erasure for XtremIO that produces a certificate - check out PS-BAS-XTDE
do we have any document to prove or can show to customer what type on the data erasure for the XtremIO ssd drive ? Example for the CX we do have doc PSBASCXDE.pdf for XtremIO do we have this kind of doc ?  as per understand for all SSD is use the Sanitize  Disk Type : SSD Erase Type: Sanitize 
Certification Data Erasure for XtremIO