I’m a business customer.
and when I had a meeting with Katalon employee. they said Katalon studio would support appium2.0. and I also found it ([Recap] Ask Katalon Experts: Live Q&A Session and Automated Testing Best Practice - #13 by albert.vu) Ask Katalon Experts article.
" Q: What is currently the latest supported version of Android and Appium with Katalon?
A: We support Appium 2.x in Katalon Studio version 9.0.0 beta and above. There is no restrictions on Android version."
so I posted this a post