They can claim anything they want to, but like they always say. "Action speaks louder than words."
I don't want to agree or disagree with what they said, but I will say that they need to put their words into action because after all, the project just launched a few weeks ago, and it's too early to say that especially if you didn't prove anything yet.
An FDV of around 20 Billion at the start is high, especially from a starting project like Starknet. Well, they have a huge community behind it. Tokens will be unlocked every month which might end up decreasing it's price as some might sell it if they can sell it.
Overall, take what they said as a grain of salt only. They're trying to attract other investors especially those who had bad experiences with Solana, and telling them to try their project as well. Throwing words like that especially when it's a new project is kind of hyping the project even more.