No, your memory is not askew ;-D
According to Orthodox News (http://www.orthodoxnews.netfirms.com/Mel%20Gibson%20Is.htm)
"Gibson and his son, the star of blockbuster films like "Braveheart" and "Lethal Weapon," are practitioners of an ultraconservative Catholic movement known as traditionalism. The small splinter group seeks to revive orthodox practices that were abandoned several centuries ago by mainstream Catholicism.
The actor has been especially forthcoming about his religious affiliation recently. Gibson is building a traditionalist church on a 9,300-square-foot complex in Malibu, Calif., for about 70 members, the Times said. He is serving as the director, chief executive officer and sole benefactor of the church, which intends to conduct its Sunday Mass entirely in Latin. The property was purchased by a church group called Holy Family."
No need for Roger Cardinal Mahoney to feel threatened ... lol.
I'm missing something. Where does your quote mention that Gibson attends SSPX Masses?