To be fair, the company in question is a property and investment management company. Salesforce isn't a great fit for real estate companies. So if they were using an uncustomized version of Salesforce, then I can see them replacing that functionality with Replit.
I'd be much more surprised if a company that fits Salesforce's architecture out of the box (like a B2B Software company) managed to replace it with something they vibe coded on Replit.