Solid advice. Tip 13 about the parades is silly. If you want to see daytime parades, see them. A new Magic Kingdom daytime parade just debuted on Sunday that supposed to be very cool and different. Unless you're a dwarf, there's no reason to sit on a curb for an hour saving a space for the daytime or nighttime parade. Just stand up and carry your kid.
Tip 15 is outdated. They have a new Magic Band system you can use so that all your information is in a bracelet. If you don't want to do that, do the fingerprints.
Tip 16 is very outdated with the new FastPass+ system. The parks are even more crowded now and lines are longer even if you have FastPass+.
For Tip 18, there are plenty of great spots to see Illuminations. Didn't think about it until I was there on Saturday, but the Japan counter service restaurant up the stairs probably has a good view.
I've never heard of Tip 19. My kids have fallen just short of height requirements and no cast member has offered them a future pass.