Something from nothing?

https://inference-review.com/article/the-beginning-of-the-universe

Nothing can be created from nothing, says Lucretius, if only because the conservation of energy makes it impossible to create nothing from nothing. For any isolated system, energy is proportional to mass and must be positive. Any initial state, prior to the creation of the system, must have the same energy as the state after its creation.

There is a loophole in this reasoning. The energy of the gravitational field is negative;17 it is conceivable that this negative energy could compensate for the positive energy of matter, making the total energy of the cosmos equal to zero. In fact, this is precisely what happens in a closed universe, in which the space closes on itself, like the surface of a sphere. It follows from the laws of general relativity that the total energy of such a universe is necessarily equal to zero. Another conserved quantity is the electric charge, and once again it turns out that the total charge must vanish in a closed universe.