Not entirely correct:
Does Adding Chlorine Raise or Lower pH?
Depending on the type of chlorine you’re using, it will either raise or lower the pH in your pool.
Chlorine tablets are typically trichlor with a low pH level of around 3.
Being acidic, adding chlorine tablets to your water will lower the pH of your water, though this effect may be insignificant if your pH level tends to increase over time – which is common in swimming pools.
Powder or granular chlorine can be more varied. You can find it as trichlor, dichlor, or calcium hypochlorite.
While dichlor is slightly acidic, it’s reasonably close to neutral with a pH level of 6.5, which means it’s going to have a much lesser effect on your pH compared to trichlor.
Calcium hypochlorite, however, is highly alkaline with a pH of around 12, so this is going to raise the pH level of the water (as well as increase the calcium hardness level, for that matter).
Finally, liquid chlorine is sodium hypochlorite with a pH level of around 13, so it’s also going to increase the pH of your water. However, liquid chlorine only temporarily raises pH, effectively making it pH neutral in the long term.
https://poolonomics.com/how-does-ph-affect-chlorine/#does-adding-chlorine-raise-or-lower-ph