Krishna explains why the world cannot see Him for what He truly is. I am not visible to everyone, He says, because I am veiled by My own Yogamaya. This deluded world does not recognize Me as unborn and imperishable.
The sun behind clouds is still the sun. The clouds themselves are made possible by the sun's heat. Yet they hide it from view. Yogamaya works the same way — it is the Lord's own power, yet it conceals Him from ordinary perception.
There is a distinction between the 'daivi Maya' of 7.14 and the 'Yogamaya' here. Yogamaya is the Lord's own mysterious power that keeps His supreme nature concealed. It is not the same as the material Maya that binds living beings to the world.