Most probably the government was urging to use that wallet to giveaway $30 in bitcoin but they are free to use any wallet and like most common is Strike among El Salvador for lightning network payment
I'm not sure what's scarier: a government-owned wallet, or an entire country that relies on a single custodial wallet. I'm totally fine using custodial LN wallets for small amounts, and I realize I put my (small) funds are in someone else's hands. If that happens to an entire country, it might need regulation similar to banks, because an exit scam would end in a bail out.