Thats hard to believe, intuitively I would expect it to bee more soluable than MDMA in IPA.
Solubility intuition only works for inorganic compunds and other things not forming hydrogen bonds and other mischief.
A case in point is the insolubility of 2C-B·HCl in water, while DOB·HCl, 2C-C·HCl and 2C-I·HCl all have good aqueous solubility.