It's not a scam. It's the nature of purchasing new, evolving products from a very small technology company.
Hard to say whether adding the RK1s to your order delayed shipment of the TPiv2.
My experience:
I received my Kickstarter pledge order in mid-April 2023. Ordered 4x RK11632s in July. Then, changed the order to 4x RK13232s when it seemed availability would be imminent. When the TPiv2.5 was announced, I ordered one and because it was supposed to ship around the same time as the RK13232s, I had the RK13232s bundled with the order to save on shipping. Then, when availability of the v2.5.x board began to slip, I had the RK13232 portion of my order broken out as a separate order. Received the RK13232 order in mid-March of this year. Now, I'm waiting for the v2.5.x board to ship.