This is so sloppy. Did you even read it? Even disregarding where it’s incorrect, you should be able to catch this of you possess a brain:
When a slime or honey block is pushed or pulled, it attempts to drag every movable block it is directly adjacent to (face, edge, or corner — faces only in Java; faces only in Bedrock too, corners excluded in both).
Edit: here are some actual resources on piston mechanics and flying machines from people who know what they are talking about: