I overstated it, and thank you for calling me on that, but one can find references that say it can breakeven.

For example:

https://netl.doe.gov/research/coal/energy-systems/gasificati...

"each ton [of CO2] can yield 2-3 barrels of oil"

Burning a barrel of oil produces 468 kg of CO2, so 2 barrels would be slightly carbon negative.