Is this mold?

Well, your super soil mix isn't quite callibrated, yet. This will take time and patience... observe and adjust for next grow. First leaf - is there a hint of blue or purple? Looks like a P-deficiency. if no blue/purp in leaf, then i'd lean Mg deficiency 2nd leaf - looks to have yellowed from tip to inside of leaf, which looks the opposite of the leaves on plant which display an interveinal chlorosis on middle aged leaves.. third leaft (2nd pic) - inspect for bugs on underside of leaves. if you sprayed something on plant, could be that too. No clawing... less likely overfed.. no super dark leaves etc etc.. and, tip burn in multiple locations on plant... together i'd attribute those to deficiency not a toxicity. So, i'd look into pH of your substrate. Ensure it is not a matter of the plant unable to use it while being present. A slurry can help. Understand it's an average, though. so you don't get a precise value of what the soil is and you need more than one sample to guesstimate better. Whichever direction it moves, it'll be some average of the known pH of water used and mass of soil you add (be consistent with both, use 7pH for sanity).... anyway, whichever direction it moves, it'll be even further in reality. the larger distance from known water's pH the further beyond it'll be. So, hopefully it stops a little short of your intended pH in substrate. If that is ~6.5ish, probably fine. a little short or a little beyond i wouldn't worry too much about as long as it is fairly consistent over time. some small oscillation is fine. There's more than one thing that is off here. which will make it difficult to adjust and assess results. Rule out pH, then refer to an leaf symptom chart. K, P, S, Mg all likely culprits based on symptoms. also, why it may be pH related. Consider recent behaviour and info that was not included in this question. eliminate possibilities and choose a course of action. super soil definitely should not have 20% runoff. you do want to ensure total saturation of entire volume of substrate, but with as little leeching as possible. So, a little runoff will be necessary and better to err on the side of a little more than needed... ensuring whole volume gets water. allow top inch to dry like normal soil before repeating process.

I think your going to need to add some nutrition added to your soil. Use correct watering practices. Water until you get 20% run off then wait for top 3 to 4 cm of the soil dry before next watering. You can check your ph run off to see what your ph and ec are. You may find your ph may be off compared to what your putting in.

The second leaf in the first picture looks like light burn. First thing I would do is check the PH and the PPM/EC of the last bit that comes out of your runoff when watering. If the PPM's raise dramatically then you know its nutrient burn. Since you have a slow release soil you dont want to do a massive water flush. I would say to make sure she dries out and only water around the base. By soaking the whole pot all of the soil is releasing nutes.

No, it looks like nuturent burn/lockout. the second picture looks like residue from a folar spray. Use just water for the next few feedings and everything should clear up. Happy growing