Yes the new plaster will push the pH up BUT if you leave the pH and TA out of range, especially on the low range, for a while it could etch your pretty, new plaster OR cause scale to form on it. pH and TA are VERY important for the long term life of plaster.
Believe me im having a hard time wrapping my head around alot of the pool math numbers. I paid for the app and am using it as a guide right now. Im still right around 14 days since plaster so adding anything now is minimal.