As you pointed out there are no rules against multi-accounting and they promote as a No KYC book with accounts linked to a Web3 wallet.
They actually do:
5.2.2. l) Not to use multi Profiles, meaning two or more Profiles owned, directly or indirectly controlled by the same individual or legal entity.
However, the entire platform is just a scam. There's no actual way for them to determine who an account holder is, so they can use this whenever they just want to scam. When they make the claim, they offer no resolution or evidence.
As said, I never even used two wallets/profiles. I would be intrigued to see the other wallet addresses that supposedly hold over 2m+ BSC USDT as the actual pool on-site shows, as the wallet address they have only shows about 3 months old with a quarter of that amount. Looks to be a literal Ponzi.