Saying craft don't appear after week X
You have edited a bunch of Apocalypse UFO entries to say they disappear at week X.
This is not necessarily true. While they will cease to be produced at a given point, this doesn't remove those already there until they're all shot down. So missing a Transporter until week 4 isn't game over; since you haven't shot down any of the six Transporters (else you wouldn't have missed them), they are still there in the Alien Dimension and will still be used if there's nothing better for the aliens to use (they prioritise Assault Ships and capital ships). And it's frequently the case that the Alien Dimension has half a dozen Probes flying around when you first start doing missions in Week 5-6, since the Scout Ships typically get depleted first.
Point noted. I will add some text which concisely points out your concern. Actually, thank you for bringing that to my attention. I'll reword it soonish over the next few days when I have some time and not rushing.