It's unusual seeing the process stated so bluntly, but for something as cookie-cutter as a company homepage this has been how web designers have done things for decades. Or, at the very least, it's how the craft is learned.
I think the Mintlify designers viewed dozens if not hundreds of examples, then thought very carefully about exactly what they needed to express for their page and how best to express it. Then they built their page step by step, sweating over every detail.
Then Kibu came along, lifted the entire thing, changed "3%" of it and called it their own.
What Kibu did is gross.
Directly copying is tacky and immoral - it's also not effective. You should be thinking about how to position _your product_ not how someone else positioned their product.