There's plenty of reasons to have missed out on a Kickstarter. Money just wasn't there. Planned to pledge but time ran out when you weren't looking. Wanting to get more info on the game and see where the campaign makes it to. But if you're looking to get in after the fact, there's the Late Pledge period that many campaigns have. Cyberpunk Red: Combat Zone is in such a zone now.
From the announcement:
It's time! The Cyberpunk Red: Combat Zone pledge manager is now live. You can pick out exactly what you'd like in your pledge shipment, upgrade your pledge, and choose from all the exciting add-ons!
Missed the campaign? No Problem! We're happy to welcome Late Backers to the game. You have access to all the same miniatures available during the campaign, plus ALL unlocked stretch goals!