Possible, but if that were so, you'd think that they would have done something for their uber respected Temple Guard granted Chief Astronomer who is uber ancient and so well regarded that it wholly shifted Lizardmen society around the omen of his spawning time being considered ill to good.
Like, not for nothing, but humans in Warhammer think a lot of things, not all of it correct. Plenty of humans think Lizardmen are daemon-creatures akin to beastmen, and think all their wards, temples, idols, and more are Chaos-related and require a righteous crusade to topple them all. All except Oxyotl and maybe Tehenahuin in modern 2520s IC Lizardmen skink roster are short-lived, with their greatest most respected Slann-like figure frail and ancient and withered. Everyone else is vibrant and young/recently spawned and positioned, or Chaos Realm warped, or whatever is going on with Tehenahuin. Rejuvenation pools enough to heal Slann from mortal wounds are noted to exist in canon materials, but will they work for humans? Or skinks? Maybe. Maybe skinks have a literal built-in time limit. Maybe they don't.
For DoDA purposes, Ulha'up doesn't have any skinks, because battle or age. S'about all that's relevant in DoDA for the moment.