Sure, as do all protocols. But assuming you're referring to the research published on April 12th of this year (https://www.chaac.tf.fau.eu/2018/04/12/zerocoinzcoinpivxzoinsmartcashhexxcoin-attack/), you may find the PIVX team's response, published on the very same day, enlightening:

https://www.reddit.com/r/pivx/comments/8bvf8r/how_todays_zerocoin_article_relates_to_pivx/