You certainly are. I wouldn't have checked your old posts. You are still watching, though, despite disliking much of the story.
That's the bare minimum of lead-in if you want to call it that. From purely the writing point of view, it still did happen very conveniently for Rudeus. He didn't really need to work for it, or anything. Nor did the Man-God. Neither could the Man-God affect Ruijerd or Kishirika Kishirisu. After the event in this ep, the Man-God said he can't see the Dragon God, so he couldn't warn Rudeus about him, but for all we know, the Man-God did foresee this and told Rudeus nothing precisely so that this meeting would happen. If you ask me, the Man-God is more like a villain, instead of Orsted.
Haha, writes himself into a corner? You can't write yourself into a corner in a single scene. He doesn't write this live, real time, in front of an audience. If he wasn't happy with the scene and if it didn't suit his purposes, he would have changed or even removed the whole thing. An author writing themselves into a corner is a more complicated process that happens over a longer period of time. Typically it happens if a story turns out to be longer than it was originally supposed to be (extremely common in shounen manga). One of the most typical such problems is power creep (extremely common in shounen manga).
It was already said that this was nothing but Orsted's introduction. This was the foreshadowing of things to happen later with him. What happened here was nothing but a basis for their next meeting, whenever that will happen. It was a pretty rough introduction, with Rudeus experiencing death, but it was still nothing but an introduction. How much do you demand from an introduction? It did fulfill its purpose of making Orsted look like a hostile giant in Rudeus's eyes, which means he needs to get stronger if he ever dreams of confronting him again. Yet it also didn't make Orsted look totally unreasonable because the woman's words could affect him and Rudeus wasn't left dead.