It's absurd to impose an opinion held 30 years ago as somehow etched in stone for all time.
And yet, Abp. Lefebvre IS etched in stone for all time. He can't change anymore. His earthly life -- opportunity to change, merit, or demerit -- ended on March 25, 1991.
So it's absurd for Sedevacantists to try to "own" or "acquire" the saintly man, when it's a fact that said saintly man never embraced the sedevacantist position.
At worst, you can't use him in the argument.
We "get" +ABL permanently, just like Sedevacantists "get" Fr. Cekada, who died a sedevacantist. (You can have him...hahaha)