It is just a mythical title not a real world title. Ring magazine may have lineal title belts but those belts have no real value or bring in even a dime. You can't just do nothing for years and stay even mythical or Ring magazine lineal champ, Fury won the lineal title by beating consensus lineal champ Wlad and rightfully so. Ring recognized him as lineal champ back then. Then Fury retired from boxing for personal problem for almost 3 years and Ring no longer recognized him as lineal champion. They have that title vacant. They will crown a lineal champion only when one man holds all the belts. That could happen if Wilder fights the winner of the AJ-Ruiz fight. Until Fury wins a world title he is no longer in the running for the lineal heavyweight title.
That's not true. Fury remains the Lineal champion and Ring Magazine recognise him as exactly that.