Probably because of predictions that there may be some tusken-related content around the corner(even legendary event/character) judging from "The Book of Boba Fett"... IF there is something planned it will still require to buy/panic farm some new marquee - but those three Tuskens we have right now will most likely be required, so...
You have to get eaten by a Sarlac, stripped by a band of Jawas, "rescued" or kidnapped by a group of tuskens, enslaved for a few weeks, prove to them you are a warrior, have significantly better acting in the flashback scenes than others, and make a staff out of a magical desert tree-branch. Do these things, then you will have your shards.
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It’ll be on rotation, so they won’t be there all the time.
To make a kickass Tusken squad just for fun.