Spoilers: Tlaqua, Zwup, and the rite. No campaign ending.

A Terradon over Tlaqua
Tiktaq'to is free Lizardmen content, qualified by Total War: Warhammer II or by a Lizardmen lord pack, the same routes that qualify Gor-Rok. He leads Tlaqua. Steam's page for the lord is the public description of the free campaign: Zwup is his Terradon, the army favours Terradon riders, and recruited Skink heroes of Tlaqua can take Terradon mounts at once. The 28 June 2022 prologue lists Tlaqua for him.
He is a flying Skink, so the battle is a meeting of air and ground. Terradons can bombard a formation. The ground force, Saurus Warriors in particular, gives the enemy something to fight while the wing chooses an approach. Skink Skirmishers harass and still need a route away from cavalry. A flight that arrives before the line is a flight the whole enemy army can shoot.
The Rite of Tzunki, and whose riders they are
The Rite of Tzunki restores campaign movement for Tlaqua's armies and characters. The lord page's caution is the useful one: pick the journey before the rite, and look at whether the destination can recover or be defended. Movement returned is not a second army.
Ripperdactyl Riders are the aerial melee unit, and they belong to The Prophet and the Warlock. The free lord does not include that roster. A Tlaqua campaign uses the flying troops the collection unlocks. Gor-Rok's Itza is the defensive Saurus campaign from the same free list. Tiktaq'to's is the air. They are not interchangeable garrisons.
Tlaqua as a dated row
The prologue's Tlaqua is the 28 June 2022 row, read the same way as The Golden Tower and the Tower of Ashung: a list published with the map. Zwup, the Terradon riders, and the Rite of Tzunki are the facts on Steam's free-lord page and on the Tlaqua campaign.
Oxyotl's Silence and the Fury and Nakai's Hunter and the Beast are later or neighbouring Lizardmen packs. They do not move Tlaqua's rite onto their campaigns. Tiktaq'to's page stays with the Terradon, the rite, and the difference between a free lord and a paid flying unit. A rite you spend is the campaign's maneuver.
Tiktaq'to: gameplay and availability · More character stories
Sources
- Tiktaq'to on Steam — store.steampowered.com
- Immortal Empires starting positions: a prologue — totalwar.com
- SEGA: Immortal Empires DLC Ownership Guide — support.sega.com