If you look at the actual criteria, and the results that Karen-W has been carefully and painstakingly documented all season long, you can see that if you actually turn senior at the beginning of an Olympic year, and you compete in international events -- Cranberry, anyone? -- including Challenger Series events, which have no minimums, you are judged on those scores compared to ranges of prior year's Worlds scores, and that includes trends. Placements don't matter, except of course, scores from prior Worlds, because they fall into the prescribed ranges of prior Worlds' scores.
If you choose to go the (mainly) Junior route, then you are going to be compared to skaters who've got the experience of competing senior programs with the extra choreo element and no jump or spin limitations in the SP, and aren't switching back and forth (which Malinin would have done, had JGPF not been canceled.)
But as long as a skater is age-eligible in seniors, skating juniors is a choice and calculated risk, but it relies on weaker competition. Zhou and Edmunds won that bet. Malinin didn't.