You're right that energy costs need to be accounted for when examining a potential capture method. But this is so blindingly obvious that of course the researchers are doing it. It is always accounted for when they are making their claims. As a single example see this recent article[1]:

> A simple chemical model estimated the rate of weathering for the crushed rock based on the local soil conditions. They also calculated energy requirements based on distance from likely rock sources, as well as accounting for the energy mix available to run everything. (The more fossil fuel burned to carry out the work, the less CO2 removed from the atmosphere in the final accounting.)

If it was true that any carbon capture method that uses energy will emit more carbon that it captures, then the researchers wouldn't have bothered doing the research. Yet they have, and do. Carbon capture is a very good avenue of research for mitigating climate change in the near term as we transition to new power sources.

[1] https://arstechnica.com/science/2020/07/spreading-rock-dust-...