I do not invest in WLFI and do not intend to invest in the future so I do not know the token unlock schedule. But according to CoinGecko, the project's total supply is 100B and more than 27B are already in circulation. That means 27% of the supply has been unlocked, not 20% as I mentioned earlier.
Modifying the smart contract to increase supply or modify the token unlock schedule is quite complicated but not impossible. That will depend on the original design as well as the blockchain it is deployed on. That's why altcoins have never been reliable.

For the presale participant, the token unlocked was 20% from the 20% total supply allocated for presale if i'm not mistaken.
The rest are for strategic partner which honestly i don't have any idea about but I bet there are also some allocation for market makers.
So yes it's actually true but I doubt it's because smart contract modification honestly. The initial circulating supply is already predetermined even before the token went live.