Is Bitcoin-lightning still not scalable?
Yes.
But with the coming  taproot upgrade and schnorr signatures we can create a single Bitcoin tx that is n - of - n multisig which enables us to do multiparty channels with n participants in 1 transaction. So if you take n=40 we can onboard 8bn people in 1 year. If you choose n=480 we can do it in 1 month. So let's keep fingers crossed for that Bitcoin upgrade.