He's probably referring to the current maximum transaction rate due to 1MB block size limit. https://en.bitcoin.it/wiki/Maximum_transaction_rate
It's really tiring to see bitcoin promoted as some sort of second-coming-of-Christ when all evidence points to it being nothing more than an interesting experiment.
When it won't be enough, Lightning network will be adapted, as there will be a need for it. Premature scaling is the root of all evil. :)