The early 'leaks' are almost always made by someone on photoshop from second-hand information they got from someone else who saw an early design, or got some inside information somehow. So they are only vaguely accurate. The colours may be right, but the rest is pure imagination.
I spoke to the adidas designers last year about leaks and how they prevent them, and they said it's really difficult, because they have to at some point send out the designs to get fabric samples made up in an external facility. Then they have to send those samples out to other people involved in the production, they also have to present these samples for sign-off by the clubs around 12 months before they are released. So stopping the leaks of information is really difficult at the early stages. Once the kits have gone into production is when the proper leaked photos start appearing, but before that we have people making fakes based on the fan-made images that are on the likes of footyheadlines or Twitter.
Back in 2019, I met the head of design from adidas at the Emirates Stadium and was shown the international kits (the ones which should have been the Euro 2020 home kits) a day or two before they were officially released. We had to sign non-disclosure forms before they showed us them.
Anyway, these ones are alright, I suppose. Bits I really like on them, bits I don't. I'd have loved it if a kit that was inspired by our 1993-95 away kit was actually black like that one was, for example. I'd have liked the 90s style collar from that third kit to also have been used on the away kit, as I think we've overused crew necks in recent years and it'd fit with the retro vibe of the rest of the shirt better.
Edit: Also, with the previous (fake) versions of the away kit, I said I didn't believe we'd ever put sky blue on a united kit, and the gradient effects would probably be made by a stipling of royal blue and white, just like on the 1990-92 away shirt. Looks like I was right.