From a light skim, it seems like the catalyst used here (Al2O3) can be used to selectively decarboxylate THCA to THC, while keep CBDA in its acid form. The purpose being to allow separation of the two into two phases.
What application are you trying to achieve? If it’s selective decarboxylation of THC, then it seems like it can be achieved if the THCA is made dissolved in the appropriate solvent reacted with Al2O3.