Do you have a source? I’d be interested in seeing how the numbers look at present. I otherwise looked into this briefly myself, and this article from ScienceFocus mentions a 2019 study by Oxford University that found more greenhouse gases are released growing lab meat than regular meat, although ScienceFocus argued that if mass produced on a similar scale to regular meat and if renewable energy was used instead, the emissions could be better than regular meat.
Another website indicates in future tense that lab-grown meat “could cut down on water usage by 90%”