I agree with your advice but the thread starter wanted to move Apps to an SD card and upon re-reading the Post I seem to remember that back in the days of my Huawei Ideos, I used Astro File Manager from Playstore which enabled Apps to be moved to the external SD card.
Not ALL Apps could be moved but the idea was for cell phones with small internal storage capacity.
My Redmi 7 has 31.3GB's of the total 64GB internal storage in use.
There is an excellent article in the How to Geeks regarding how much internal storage is really required in a cell phone (relates to iPhones but it is a good guide)..