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Generally clans have to die before they get legend. Clans like alpha probably will get it when they die, but they haven't died yet.
Legend status doesn't mean that you've just been around for long, so if you want a short answer to this suggestion - no, what you're suggesting is not happening.
Clans' legendary status does not just give clans a golden name the way players' legendary status does, it modifies the way these clans are treated in the system - they're exempt from activity checks while maintaining official status forever, but they also get their roster locked down. The latter is the main reason we tend to only give legend to dying / dead clans, because any actually active clan would likely prefer being able to still recruit new members, and having listed as a 10+ year old clan is already a flex on its own.
Another reason "just" old clans may not receive the legend status (even after they die) is because these clans underwent such drastic changes across their existence that at some point they became pretty much new clans under an older and cooler name. Don't get me wrong though, clans naturally evolving and changing their members is not a bad thing on its own, but saying that clans which just survived for long yet have zero players out of those who made the clan stand out in the first place deserve legend is pretty bold. Almost all us who make the decision remember the "old times" of these clans, but no matter how we'd like to honor their original members we must consider what these clans are like right now.
In that sense, clan going inactive is the best time for us to consider whether they should be given legendary status as we can have a definitive look at what they've done in their run and whether they've maintained the qualities we'd expect from a legendary clan.
Also yeah we're definitely same as NK. How dare we not give all clans you like legend status.
What if a clan have died and was tittled legendary and years later they revive it to 100 percent does the tittle get removed or they can keep it?
Quite argumentatively. But one question still remains. What to do to clans that have completed all the achievements? I repeat that the first and second places in the top of activity were for the guys who just took a couple of achievements. You must either add new ones or make sure that achievements do not give activity points
They can get back together but they won't be able to recruit any new members (according to current legendary clans setup).
Achievements don't affect clan ranking, both uwu and Aqours are simply more active than Damned. Either way your question is unrelated to this thread, if you want to suggest clan ranking changes please make a new thread dedicated to that.