In pure numbers, yes. But in reality our undisputed #1 of that group is quite limited these days with large question marks over whether he's actually good enough anymore, should only play one game a week, and (other than Mount) is probably the most likely player in the squad to miss significant amounts of games this season due to injury.
Our backups then consist of a player who is also our backup on the right, is better on the right, and has injury concerns of his own. A young player who is decent when in possession but has shown quite a bit of defensive weakness. And a player who has basically never played at leftback for us and who the manager doesn't seem interested in using there.
As a group, it's not enough.