I had much the same problem and result referencing image 1.2.
I think part of the problem may be that this guide is for Galaxy Tab A 10.1 2016 (T585?).
I deduced that from image 4.2 which shows a 2016 date on the battery, also reviewing the dates of the earlier posts.
Mine is a Galaxy Tab A 10.1 2019 T515 (someone I loaned it to shattered the screen for me.)
Might want to make a note of the model on the post and in particular the display reorder link .