So I'm guessing (too lazy to look it up) you are inland, not in one of the coastal enclaves that have chronic late morning fog until noon or 1 o'clock.

Anyway...lithops can be addictive once the bug bites. With that said, the bonsai mix you linked would be fine but it already has an organic component. I would choose this instead... Boon Bonsai Soil, same price and quantity .... https://smile.amazon.com/dp/B0762XXHSJ/ref=cm_sw_r_apan_i_0H6WPRK1KET64CVE91D6

The mix itself works fine. Serious growers might chime in about pH, etc that the various materials can add to the pot. But the composition isn't totally necessary for the hobby grower...IMO.

I personally prefer the smaller 1/8-inch size...small roots, small particle size and would prioritize that.

If I could only purchase one item, I would select 1/8-inch 100% pumice mixed with well-sifted succulent mix over the aggregate combos like the bonsai/succulent mix.

I purchased this.... 3 Gallon Bag Garden Pumice (1/8" Stone) https://smile.amazon.com/dp/B06XP36YCM/ref=cm_sw_r_awdo_JQT2K59J0ZK8VM5A11RQ

You can also use it for your succulents as a top-dressing. I think the size is perfect and would work if you decide to try seeds. You might have to pick through it a little and I always rinse a big batch (to remove dust and fines that could clog the root system) and have it ready to use as needed.

It's costs a little more but it's 12 quarts of product vs 1.25 quarts.