I watched the entire director's commentary of Outland.
"In the future, the whole concept of non-sleek looking, non-romantic looking kind of set in the future, is totally due to Ridley Scott making Alien and Blade Runner. That's the genesis of giving some people like me the courage to say 'oh I think I know what it should look like', and then work within it." - Peter Hyams
That's the only reference to Alien. Again, seems to me more like an aesthetic design choice more than anything. Underwater is similar in this regard, but that actually has in-universe connections so I feel that's understandable (Weyland Corp categorically exists because we can see it in the movie).
This is obviously not a completely reliable source, but here's someone's claim about it when they asked the costume designer for Alien/Outland.
https://www.therpf.com/forums/threa...did-they-live-in-the-same-world.186275/page-2
Some people claim that they read something about them being unoffically linked in Starlog Magazine, but Peter Hyams actually distanced himself from the Alien influence in the
actual magazine.
https://alienseries.wordpress.com/2015/10/02/outland-alien/
When we're ignoring basically the entire Fox consultant's canon tiers because it doesn't make any sense (and has shifted because even he can't decide what's canon), I think we can ignore the shoehorn canon thing. That was made with the idea that the inclusions could fit in the same universe, but will never be officially the same. It's more of an opinion. There's no way Fox considered Outland more canon than Predator. Heck, there's no way they considered Blade Runner/Soldier more canon than Predator.
I don't feel comfortable having Outland on this timeline for those reasons, but I'll keep it copied just in case Megatron wants to use it for the expanded timeline.
Also, I've dated Predator versus Wolverine now. I worked it out based on the sliding timeline and the actual canon dates for Wolverine's past. Team X operated in 1961-1968, Wolverine's bone adamantium coating always happens in 1974, Wolverine trained with Muramasa decades ago, so 1980s seems reasonable, and the mid-point of Wolverine wearing brown suit worked out as 2014 using the sliding timeline.