doesn’t this mean that geoengineering is also effective at giving us extra time?

I have zero faith in governments nor societal leaders actually maintaining any geoengineering efforts consistently which is what would be required. Any time geoengineering buys would be squandered by inaction. I do not expect any significant action to occur until it immediately threatens businesses and governments in ways that cannot be ignored by even the most head-in-the-sand deniers

If we geoengineer, it will be half-assed, and the moment the scope shrinks (as funding naturally grows and shrinks depending on who's setting budgets for administrations) every bit of climate change effect that we held off will come crashing down far more rapidly than the slow crawl we've been experiencing for the past century or so

We’d start using safer gases that have the same cooling effect

If I, as a rando on the internet we're to guess, the most cost effective tactic would be very large pumps firing ocean water into the air either to evaporate naturally or artificially evaporated to create more clouds. Clouds reflect sunlight and artificially creating more would slow ocean warning, and therefore slow global climate change. I'm certain the salt and other crap in the water would have difficult to predict downstream effects, at best creating more rain, at worst salting the rainforests