Note that this is blix, specifically. It comes in two components, A and B, and you need both. You generally don't need a starter for the blix.
Going by the photos, the listed products are old stock. This needn't be a problem.
100 liters is a lot of blix.
In addition to the blix, you'll need a developer. It's OK to use a different developer (Arista, Champion, Fuji etc.) with a Kodak blix and vice versa.
A replenisher is a slightly more concentrated and more alkaline RA4 developer. If used without seasoning or adding starter, it generally produces poor results. The starter is added (plus some additional water) to bring the developer on spec. This system works with large tanks/racks in mind where you typically replenish and not often replace the entire contents of the machine.
For home use in drums, kits like Arista etc. work without a starter or replenisher. They can be used one shot. They can also be reused until...well, there's no hard & fast rule. Until the results don't look good anymore or until you don't trust the consistency. Take your pick.
I find one shot with RA4 wasteful. Others swear by it. It's a matter of preference.
You might find this relevant:
https://tinker.koraks.nl/photograph...ta-using-color-c41-and-ra4-chemistry-at-home/