I’ve noticed this more recently. Ironically, it seems to be more common with coding communities known for their welcoming spirit and helpful nature, for example Rust.
Gratuitous repetition of how easy something is can make it feel harder when understanding is not immediate.
The post is right: if you're explaining something, it's because the other person could not understand it without help, which means it's not, in fact, easy. It might be easy to repeatedly use it once you understand it, but it's not easy to grasp in the first place - otherwise you wouldn't have to be there in the first place.