he/they are just using stealth, his resignation was just a fig leaf but his and their judicial philosophies are the same.
Whether Kavanaugh is an "active" member or not; it's just six or half a dozen.
(snip)
Kavanaugh was worried that if the press mischaracterized his ties to the Federalist Society it would suggest an "ongoing relationship" with the organization.
In the email chain Kavanaugh wrote, "the reason I (and others) resigned from Fed society was precisely because I did not want anyone to be able to say that I had an ongoing relationship with any group that has a strong interest in the work of this office."
Given his role in the White House of selecting judges himself, Kavanaugh, President Donald Trump's nominee for the Supreme Court, might have thought that the optics of being a member of the Federalist Society, an organization that has a distinctive conservative leaning with a special interest in selecting conservative judges to the courts, would hurt his credibility and image.
(snip)
Despite what he told colleagues in 2001, when Kavanaugh filled out his Senate Judiciary Questionnaire on July 20, 2018, he wrote that he had been a member of the Federalist Society since 1988 without any gaps in membership.
(snip)
https://www.cnn.com/2018/08/19/politics/brett-kavanaugh-federalist-society-emails/index.html
Kavanaugh is proud of his Federalist Society membership and de facto there is no real daylight between him and them regardless of his active/inactive status with that group or whether they officially approved him or not.